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7190296 |
Low power, high SNR, high order delta sigma modulator stage having integrators with pipelined cross coupled input circuits
In a high order delta sigma modulator stage having integrators with pipelined cross coupled input circuits, the processing delay between an upstream integrator and a downstream integrator is...
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7190295 |
Accumulator for adaptive sigma-delta modulation
A system and method for adaptive sigma-delta modulation. The system includes a input stage that produces a difference signal representing the difference between an analog input signal x(n) and a...
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7187313 |
Fractional-N frequency synthesizer with sigma-delta modulator for variable reference frequencies
A frequency synthesizer includes: a phase detector, a loop filter, a controllable oscillator, a frequency divider, and a sigma-delta modulator for providing the division factor according to an...
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7187312 |
Look-ahead delta sigma modulator having an infinite impulse response filter with multiple look-ahead outputs
A delta sigma modulator look-ahead IIR filter response can be divided into a natural response and a pattern response using superposition techniques. The look-ahead delta sigma modulators of the...
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7188087 |
Devices, systems and methods for restricting use of digital content
Devices, systems and methods for restricting use of digital content are provided. Among those embodiments which may be construed as providing a method for restricting use of digital data, a...
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7183957 |
Signal processing system with analog-to-digital converter using delta-sigma modulation having an internal stabilizer loop
A signal processing system includes an analog-to-digital delta sigma modulator with a duty cycle modulator and a finite impulse response (FIR) filter in a main loop feedback path of the delta sigma...
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7183956 |
High speed digital delta-sigma modulator with integrated upsampler
Apparatus, and a related method, for converting digital signals directly to radio-frequency (RF) analog signals. The apparatus includes a single high-speed delta-sigma modulator and an integrated...
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7183954 |
Circuits, systems and methods for volume control in low noise 1-bit digital audio systems
A data converter including a digital volume control for continuously scaling a received stream of digital audio data by a selected factor and a low noise delta-sigma modulator for re-quantizing a...
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7183955 |
Sigma-delta modulator, D/A conversion system and dynamic element matching method
A sigma-delta modulator. The sigma-delta modulator comprises a summer, a loop filter, a quantizer, a D/A converter and a dynamic element matching logic. The summer receives an analog input signal...
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7180432 |
Method and apparatus for complex cascade sigma-delta modulation and single-sideband analog-to-digital conversion
A complex cascade sigma-delta modulator for analog-to-digital conversion applications. The modulator includes first and second sigma-delta modulator stages, combined with a complex digital noise...
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7176818 |
Analog to digital converter, related method and use in voltage regulator circuits
An apparatus adapted to convert an input analog signal to an output digital signal includes means adapted to convert a first digital value of the output signal of the apparatus to a first analog...
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7176821 |
Reduced area digital sigma-delta modulator
A digital sigma-delta modulator requiring minimal die area and dissipating minimal power is formed with a plurality of integration stages coupled in tandem between an input node and an output node....
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7176822 |
Analogue-to-digital converter
An analogue-to-digital converter includes a summing element for combining an analogue input signal of the analogue-to-digital converter with a feedback signal in order to generate a fault signal, a...
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7176819 |
Precision low noise-delta-sigma ADC with AC feed forward and merged coarse and fine results
A delta-sigma converter has coarse and fine ADCs, wherein an integrated error signal is coupled to the coarse ADC whose output drives a DAC to create feedback that achieves loop balance. The coarse...
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7176820 |
Multiple input sigma-delta architecture
A number of parallel modulation functions are configured to provide sigma-delta modulation on a plurality of low sampling rate signals, which are representative of a high sampling rate input...
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7173485 |
Phase-compensated filter circuit with reduced power consumption
A filter circuit includes a plurality of integrator stages, each stage including a voltage-to-current converter to convert an input voltage into a current supplied to an output thereof and a...
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7173555 |
Method and system for nonlinear and affine signal processing
A method of nonlinear and affine signal processing includes the steps of introducing an input signal into a system which exhibits nonlinear behavior, the input signal including a target signal and...
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7170434 |
Look-ahead delta sigma modulator with quantization using natural and pattern loop filter responses
A look-ahead delta sigma modulator reduces and simplifies the computations used to generate quantizer output values. Superposition can be applied to a loop filter response of the look-ahead delta...
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7167119 |
Delta-sigma modulators with double sampling input networks and systems using the same
A method of sampling an input signal in a delta-sigma modulator having at least an integrator stage and a feedback digital-to-analog converter (DAC) stage includes sampling an input signal at a...
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7167118 |
Centered-pulse consecutive edge modulation (CEM) method and apparatus
A centered-pulse consecutive edge modulation (CEM) method and apparatus provides a pulse output that advantageously exploits the full edge update rate of the CEM while providing substantially...
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7164378 |
Analog-to-digital converter with reduced average input current and reduced average reference current
Novel system and methodology for sampling analog input signals to reduce an average common-mode input current caused by unbalanced nodes of an input signal source. An analog-to-digital (A/D)...
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7164376 |
Dual-mode delta-sigma analog to digital converter system and method
A dual-mode delta-sigma analog to digital converter system is disclosed that uses a feed forward modulator and includes a low frequency resonator circuit and a high frequency resonator circuit and...
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7164375 |
Analog to digital converter using both analog and digital offset voltages as feedback
An A/D conversion unit includes an A/D converter, an analog offset canceller connected to the input end of the A/D converter, and a digital offset canceller connected to the output end of the A/D...
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7161510 |
Switching amplifier comprising a delta-sigma modulation circuit
A switching amplifier is provided with a delta-sigma modulation circuit that performs delta-sigma modulation of an input signal that is either an analog signal or a multi-bit signal and outputs a...
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7158063 |
High-resolution sigma-delta converter
A sigma-delta converter is disclosed. In one embodiment, the sigma-delta converter includes two series-connected converter stages which are each supplied with a feedback signal, a comparator stage...
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7158062 |
Clocked DAC current switch
A switch having a first arrangement for providing a first set of first and second complementary intermediate signals; a second arrangement for providing a second set of third and fourth...
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7152010 |
Calibrating an analog-to-digital converter using a test signal with a precise DC voltage
A self-calibrating sigma-delta converter (SCADC) functions in a calibration mode and in an operational mode. In the calibration mode, a test circuit of the SCADC generates test signals that are...
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7151474 |
Controlled current source; in particular for digital/analogue converters in continuous-time sigma/delta modulators
The present invention relates to a controlled current source having a control input, in particular for digital/analogue converters in continuous-time sigma/delta modulators, having a current source...
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7148829 |
Delta-sigma modulation circuit with gain control function
A delta-sigma modulation circuit with a gain control function includes a variable gain amplifier, a control unit that controls the gain of the variable gain amplifier, a delta-sigma modulator that...
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7148830 |
Look-ahead delta sigma modulator with pruning of output candidate vectors using quantization error minimization pruning techniques
A look-ahead delta sigma modulator utilizes pruning techniques to reduce the number of possible output candidate vectors used to determine quantization output values. The look-ahead delta-sigma...
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7145936 |
Bandpass delta sigma truncator and method of truncating a multi-bit digital signal
A bandpass delta sigma truncator receives a series of first multi-bit digital signals each having a number of data bits, a first number of sign bits and sign extending means for sign extending each...
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7145491 |
Time-interleaved band-pass delta-sigma modulator
A time-interleaved bandpass delta-sigma modulator is developed which includes a first adder and a second adder and a comparator. An input signal is transmitted to the first adder according to the...
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7146144 |
Frequency agile exciter
Systems and methods are provided for providing high dynamic range operation over a variable range of frequencies. A delta-sigma modulator, having associated frequency characteristics, produces a...
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7145492 |
Data management method
A data management method that by encrypting and distributing digital content prevents copyright infringement, and that prevents authorization information for decrypting the encrypted digital...
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7142606 |
Method and apparatus for shared processing a plurality of signals
A signal processing apparatus preferably suitable for implementation as an integrated circuit, that is arranged and constructed to be shared for processing a plurality of signals without...
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7142143 |
Time-continuous sigma/delta analog-to-digital converter
Time-continuous sigma/delta analog-to-digital converter for converting an analog input signal into a digital output signal (D), having at least one analog filter ( 3 ) which filters the analog...
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7142070 |
Two-point modulator arrangement
A two-point modulator arrangement is specified, said arrangement being developed with respect to conventional two-point modulators to the effect that the high-pass coupling-in point of the...
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7142144 |
Low power sigma delta modulator
A low power analog-to-digital channel includes a decimation filter coupled to a sigma-delta modulator. Various embodiments include a decimation filter including an output and a sigma-delta...
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7142819 |
Circuits and methods for controlling switching noise in switched-mode circuits
A method of controlling noise in a pulse width modulation circuit includes varying a sample frequency and a range of information levels, wherein each sample within a data sample stream at the...
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7142142 |
Multi-bit ADC with sigma-delta modulation
An oximeter uses a sigma-delta modulator and a multi-bit ADC with PWM feedback enabling high precision multi-bit conversion. Demodulation is done in software, thus requiring only a single hardware...
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7138935 |
Low noise digital to signal interval converter with audio applications
The present invention relates to digital-to-analog conversion. In particular, it has application to conversion of pulse code modulated signals, such as used in CDs and DVDs, to a pulse width...
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7138932 |
Signal converting apparatus for integrating analog-to-digital converter and digital-to-analog converter and integration unit
A signal converting apparatus for integrating an analog-to-digital converter (ADC) and a digital-to-analog converter (DAC) and an integration unit thereof are provided. The present invention...
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7138934 |
Pattern biasing for look-ahead delta sigma modulators
Look-ahead delta sigma modulators of a signal processing system can selectively bias one or more output candidate vectors to alter the probability of selecting a biased output candidate vector(s)...
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7136001 |
Continuous-time integrating filter with minimum phase variation, and bandpass ΣΔ modulator using such a filter
The disclosure pertains to continuous-time filtering. More particularly, it relates to filtering in a feedback control loop, for example in a sigma-delta (ΣΔ) modulator. The making of a filter...
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7132967 |
Modulation system
A 6-bit output code word is generated in response to every 4-bit input code word by referring to a set of encoding tables. The encoding tables contain output code words assigned to input code...
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7132968 |
Hardware-efficient implementation of dynamic element matching in sigma-delta DAC's
A data shuffler apparatus for shuffling input bits includes a plurality of bit shufflers each inputting corresponding two bits x 0 and x 1 of the input bits and outputting a vector {x 0 ′, x 1...
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7129873 |
Variable-order delta sigma modulator and DA converter
The variable-order delta sigma modulator of the invention is capable of setting an optimum order in relation to a sampling frequency to be used, when using one out of plural sampling frequencies....
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7129874 |
Method and apparatus for operating a pipelined ADC circuit
An analog-to-digital converter (ADC) circuit that converts an analog input signal into a digital output circuit includes a noise shaping first stage cascaded with a pipelined second stage. The...
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7129875 |
Tracking reference system for analog-to-digital converter systems
An analog-to-digital (A/D) converter system is provided that compensates for operating variations associated with one or more passive components of the A/D converter. In one aspect of the present...
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7129876 |
Digital-analog converter
A digital-analog converter includes a counter ( 13 ) for performing counting operation according to clocks (CK 1 , CK 2 ), a comparator ( 12 ) for comparing the count value to a digital input value...
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