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6717538 |
DA converter and data reproducing apparatus
A Δ·Σ type DA converter is provided with a digital circuit 21 including a PWM circuit 26 and an analog circuit 22 , wherein in order to make an output of the analog circuit 22 a...
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6718502 |
Precoders for partial response channels
Precoders and their corresponding logic schemes, together with a method of using the precoders and their schemes to generate a media code sequence of symbols for data storage channels, with partial...
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6717537 |
Method and apparatus for minimizing latency in digital signal processing systems
A method and an apparatus for minimizing latency in digital signal processing paths. One example is an active noise cancellation device. The system includes a digital closed feedback loop having a...
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6710733 |
Comparator circuit
Differential signals output by a transfer unit of a latch stage are fed back to a comparator stage as negative feedback signals through a feedback circuit including a differential amplifier...
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6710729 |
Idle channel tone and periodic noise suppression for sigma-delta modulator using feedback-quantizer
A sigma-delta modulator. The sigma-delta modulator comprises an integrator, a first quantizer, a dither generator and an adding device. An input terminal of the first quantizer and an input...
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6710728 |
Delta-sigma analog to digital converter
The present invention improves an analog front-end of a Delta-Sigma analog-to-digital converter (ADC), so that by keeping the simple construction a significant improvement of the resolution is...
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6707408 |
Sigma-delta pulse-width-modulated signal generator circuit
A circuit for generating a pulse-width-modulated signal comprises a phase-locked loop (PLL) having a duty-cycle-insensitive phase comparator and a Sigma-Delta pulse width modulation circuit...
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6707855 |
Digital delta sigma modulator in a fractional-N frequency synthesizer
A digital delta-sigma modulator for controlling a multi-modulus divider in a fractional-N frequency synthesizer features cascaded delta-sigma modulator stages in a feed-forward circuit topology to...
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6707405 |
Integrated analog multiplexer
An integrated analog multiplexer with several multiplexer inputs, a multiplexer output, a switch device and a differential amplifier with an inverting and a non-inverting amplifier input as well as...
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6707407 |
Method for converting a video signal from one of an analogue and digital form to the other of the analogue and digital form with enhanced signal to noise ratio
A method for converting multi-bit digital video data signals to analogue form wherein the video data signals are in three formats, namely, standard definition, progressive scan and high definition...
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6707409 |
Sigma-delta analog to digital converter architecture based upon modulator design employing mirrored integrator
A delta to sigma modulator or analog to digital converter uses a mirrored integrator. (The mirrored integrator has a frequency response function that is a mirror image—about half the Nyquist...
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6703959 |
Signal detecting method and signal detecting device
In a signal detecting method of repeating the processes of initiating accumulation of charge signals by switching an integrating amplifier to an accumulator mode, retaining a first electric signal...
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6700520 |
Multi-bit continuous time sigma-delta ADC
A multi-bit continuous-time sigma-delta analog-to-digital converter provides a digital output signal as a digital representation of an analog input signal. The converter performs several functions...
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6700519 |
Delta sigma type AD converter
On a first stage of the delta sigma type AD converter for quantizing an input analog signal and converting it to an output digital signal. The computing element adds a feedback signal from a second...
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6700518 |
Digital switching amplifier
A digital switching amplifier is provided with attenuation sections that attenuate respective 1-bit signals that have been subjected to the power amplification. Also, an offset voltage addition and...
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6697000 |
Delta-sigma modulator with feed-forward path
A delta-sigma modulator comprising a number of integration stages and having a feed-forward path from a signal input section to the signal path prior to a final integration stage, so as to reduce...
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6696998 |
Apparatus for generating at least one digital output signal representative of an analog signal
An apparatus for generating a digital signal representative of an analog signal includes two signal conversion devices, each having an analog signal section coupled with an input locus and a...
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6697001 |
Continuous-time sigma-delta modulator with discrete time common-mode feedback
Systems and methods are described for a continuous-time sigma-delta modulator with discrete time common-mode feedback. The method includes calculating an integrator input signal as a difference...
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6697003 |
System and method for dynamic element matching
Dynamic element matching systems and methods are provided in which a current dynamic element matching code is generated according to a previous dynamic element matching code, a digital input code,...
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6697688 |
Audio information processing system
A tone-quality improving portion applies a bit expansion process, an oversampling process, and a bandwidth expansion process to audio information that is decoded by a decoder, and then supplies...
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6696999 |
Sigma delta modulator
A sigma delta modulator having an integrator with a first input for coupling to an analog signal and a second input for coupling to a reference voltage. A comparator is provided having a first...
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6697002 |
Low-pass filter
A low-pass filter ( 700 ) includes a differential operation circuit ( 2 ), a voltage-current conversion circuit ( 3 ), and a capacitor (C 1 ). The voltage-current conversion circuit ( 3 ) and the...
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6697006 |
Conditioning circuit for selectively buffering an input signal to a signal processing circuit, and a signal processing circuit incorporating the conditioning circuit
A signal processing circuit comprising an ADC ( 5 ) to which differential signals and pseudo-differential signals are switched through two multiplexors ( 8 ) and ( 9 ). Positive input signals are...
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6697004 |
Partial mismatch-shaping digital-to-analog converter
A novel mismatched-shaping DAC architecture is described. The inventive DAC partially spectrally shapes data conversion errors. In accordance with the present invention, the DAC mismatch-shaping...
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6693572 |
Digital tuning scheme for continuous-time sigma delta modulation
Systems and methods are described for a digital tuning scheme for continuous-time sigma-delta modulation. The method includes integrating a voltage from a voltage source using a discrete-time...
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6693574 |
D/A converter and delta-sigma D/A converter
When a clock φ1 is in high state, based on a digital signal, capacitive elements C 11 to C 1 i are connected between a reference voltage Vr+ or Vr− and a sampling ground V1 to hold a charge...
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6693571 |
Modulation of a digital input signal using a digital signal modulator and signal splitting
A digital signal modulator modulates a digital input signal to drive a load, such as an opposed current amplifier or other opposed current converter. The combinations of frequency relationships and...
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6693576 |
Methods and apparatus providing multiple concurrent acquisition modes in a digitizing measurement instrument
A method and apparatus enabling the substantially concurrent operation of multiple decimators within a digitizing measurement device such as a digital storage oscilloscope (DSO), wherein the...
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6693573 |
Mixed technology MEMS/BiCMOS LC bandpass sigma-delta for direct RF sampling
An improved sigma-delta modulator is disclosed. The sigma-delta modulator utilizes Micro Electro Mechanical System (MEMS) technology coupled with on-chip LC networks. MEMS switches are used to...
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6683550 |
High precision, high-speed signal capture
A topology for converting an analog input signal at an input port into a corresponding digital output signal at an output port includes a plurality of substantially identical ADC stages. Each ADC...
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6683548 |
Analog isolation system with digital communication across a capacitive barrier
An isolation system is provided that is suitable for use in telephony, medical instrumentation, industrial process control and other applications. Preferred embodiments of the invention comprise a...
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6683905 |
Dual-mode receiver
A common dual-mode physical layer architecture for a communications receiver is capable of receiving either frequency hopping spread spectrum signals or direct sequence spread spectrum signals. A...
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6683551 |
Digital-to-analog converter and method of operation
The invention may relate to a digital to analog converter. The digital to analog converter may comprise a plurality of controllable current sources and a control circuit. The plurality of...
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6680679 |
Method and apparatus for electrical conversion of non-return to zero encoded signal to return to zero encoded signal
A method and apparatus for electrically converting a NRZ signal into a RZ signal. A NRZ signal is summed with a phase-aligned clock signal. The resultant summed signal is then passed through a...
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6680682 |
Process for the analog/digital conversion of an analog signal within a terminal of a wireless communication system, for example a mobile telephone, and corresponding terminal
A remote terminal includes a receiver stage for receiving a transmitted signal and for delivering an analog signal. The remote terminal further includes an analog/digital converter for converting...
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6680680 |
Process and device for converting an analog signal into a digital signal with automatic gain control
A method for converting an analog signal into a digital signal with automatic gain control includes inputting an analog signal into an analog-to-digital converter of a delta-sigma type having an...
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6677876 |
Differential sigma-delta DAC with dynamic spectral shaping
A sigma-delta DAC circuit 10 includes a sigma-delta modulator 12 for producing and outputting an n-bit digital signal representative of an input analog signal, wherein n is a positive integer...
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6677875 |
Sigma-delta analog-to-digital converter and method
A sigma-delta analog-to-digital converter ( 10 ) having DEM ( 14 ) facilitated data weighted averaging to select specific unit elements of a negative feedback loop digital-to-analog converter ( 15...
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6674381 |
Methods and apparatus for tone reduction in sigma delta modulators
Sigma delta modulators and digital to analog converters therefor are disclosed, in which intentional mismatch is provided in circuit elements of the digital to analog converter to facilitate tone...
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6674382 |
Line driver structures that enhance driver performance
Line drivers are provided that are suitable for driving communication cables (e.g., in Data Over Cable Service Interface Specification (DOCSIS) certified systems) without the need for output...
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6670901 |
Dynamic range on demand receiver and method of varying same
A dynamic range on demand radio frequency (RF) receiver ( 300 ) includes a wideband detector ( 303 ), off-channel detector ( 313 ) and on-channel detector ( 327 ) supplying input to an automatic...
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6664908 |
Synchronized pulse width modulator
A delta-sigma modulator for an analog-to-digital converter device and method for reducing a quantization error resulting from differences between the periods of the delta-sigma quantizer clock and...
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6664850 |
Delay variability reduction method and apparatus
A method for reducing delay variability in a differential receiver includes receiving a plurality of differential input signals, determining a first transition delay time of an output in response...
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6661359 |
Device and method for generating synchronous numeric signals
A device for generating synchronous numeric signals, including a reference generating device supplying a reference signal and a first timing signal, both having a reference frequency; and a timed...
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6661363 |
System and method for adaptive sigma-delta modulation
A method and system for an adaptive sigma-delta (Σ-Δ) modulator with one bit quantization that improves the signal-to-noise (SNR) of a Σ-Δ modulator is presented. A difference signal is...
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6657571 |
Data acquisition system using delta-sigma analog-to-digital signal converters
A delta-sigma A/D converter includes a delta-sigma modulator having an integrating amplifier dispose within the loop of the modulator so that the input of the modulator can be connected to receive...
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6657566 |
Conversion of a PCM signal into a UPWM signal
To correct non-linearity and noise in the conversion of a pulse code modulated signal (PCM) into a uniform pulse width modulated signal (UPWM), a model is made of the known non-linearity in the...
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6657572 |
Digital noise-shaping filter with real coefficients and method for making the same
A digital noise-shaping filter with real coefficients for delta-sigma data converters used in a digital amplifier, 1-bit digital/analog converter, 1-bit analog/digital converter and the like, and a...
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6653967 |
Fully differential sampling circuit
To provide a fully differential sampling circuit which reduces a sampling error to suppress the occurrence of a second harmonic component. The sampling error is resulted from voltage dependence of...
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6653960 |
Stabilized power supply using delta sigma modulator
A switching signal generator for a switching power supply employing a DC-DC modulator has an adder, an integrator and a quantizer. A gate driver circuit is provided upstream of a power switch...
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