Patents in Class 327/552

Matches 51 - 100 out of 1256

Match	Document	Document Title
51	7411444	Technique for improving antialiasing and adjacent channel interference filtering using cascaded passive IIR filter stages combined with direct sampling and mixing A technique of improving antialiasing and adjacent channel interference filtering uses cascaded passive IIR filter stages combined with direct sampling and mixing. The methodology and related...
52	7403063	Apparatus and method for tuning center frequency of a filter A tuning method and a tuning apparatus for tuning a filter are disclosed. The tuning method includes: configuring the filter as a VCO; utilizing the VCO to generate an oscillation signal according...
53	7400190	Self calibration of continuous-time filters and systems comprising such filters Continuous-time filter system with self-calibration means. The system comprises a master control unit ( 36 ) and a slave unit with one or more slave filters ( 27.1 - 27 .n). The master control unit...
54	7400212	Self-tuned active bandpass filters An automatically tuned on-chip active continuous-time real bandpass filter operates on a differential signal while simultaneously being tuned using a common-mode (CM) reference signal, which...
55	7397292	Digital input buffer with glitch suppression A delay and deglitching circuit suppresses glitches occurring in a received digital signal while introducing a predetermined delay to the signal. The deglitching circuit comprises an RC filter and...
56	7385438	Active filter for reduction of common mode current An active filter for reducing the common mode current in a pulse width modulated drive circuit driving a load said drive circuit comprising an a-c source, a rectifier connected to said a-c source...
57	7375583	Low noise lowpass filter A differential biquad filter includes positive and negative single ended circuits connected between first and second power supply terminals. Each single ended circuit includes a single input...
58	7375582	Polyphase filter with integrators Polyphase filters comprise a plurality of filters each filter having passive elements. The filters are provided with integrators comprising amplifiers with admittance elements in feedback paths to...
59	7368981	Limit circuit A limit circuit capable of providing high gain. The limit circuit included in an FM receiver comprises, for example, seven amplifiers ( 11 to 17 ), and a BPF ( 18 ) inserted substantially in the...
60	RE40292	Bandpass filter The bandpass filter has a comparatively large pass bandwidth, with, at the same time, comparatively steep edges up to the stop band and low attenuation in the passband. The bandpass filter contains...
61	7365668	Continuous-time delta-sigma analog digital converter having operational amplifiers The invention concerns a continuous-time delta-sigma analog-digital converter for the conversion of an analog input signal into a digital output signal, comprising an analog filter which filters...
62	7358799	Switchable high pass configuration and an optical receiver with a switchable high pass configuration The invention relates to a switchable high-pass filter arrangement which has a lower limiting frequency determining the high-pass filter behavior. The arrangement includes a transistor circuit,...
63	7345527	Ultra wideband filter based on a pair of cross-coupled transistors An ultra wideband filter is provided that filters an input signal using a pair of cross-coupled transistors with a small size and small power consumption. The ultra wideband filter includes a...
64	7342435	Input stage resistant against negative voltage swings Apparatus ( 10 ) comprising a level shifter ( 15 ) connectable to a signal input ( 1 ) for receiving an input signal (s(t)) with a negative signal swing. The level shifter ( 15 ) provides for a DC...
65	7339418	Differential filter topology with dielectric absorption cancellation for a data acquisition device In one embodiment, a differential filter is configured using a differential operational amplifier (op-amp) with two feedback RC networks, each RC network coupled between a respective input and a...
66	7339420	Method of switching PLL characteristics and PLL circuit A loop filter which is a component of a PLL circuit includes a switching element for switching a capacitance value which connects and disconnects a second capacitive element to a first capacitive...
67	7340237	Dual-band active filter The present invention discloses a dual-band active filter having filtering response and positive pass-band gain. The dual-band active filter includes an input match unit for gain match of the...
68	7339419	Filter circuit array A filter circuit array is disclosed. In one embodiment, the filter circuit array includes a higher-order filter circuit array, wherein one energy storage per order of filter is provided. The...
69	7323928	High capacitance integrated circuits An integrated circuit providing high equivalent capacitance ranging from a few tens of picofarads to a few nanofarads is presented. The integrated circuit includes active integrated circuit...
70	7315199	Q value correction of filter circuit This is a filter circuit for keeping a Q value constant and stabilizing the gain ripple and group delay ripple of a filter by keeping the unity gain frequency of an operational amplifier (op-amp)....
71	7304533	Integrated channel filter using multiple resonant filters and method of operation A circuit includes a first filter comprising a first inductor coupled to a first variable capacitor, wherein the first filter is associated with a first resonant frequency. The circuit further...
72	7301391	Filtering variable offset amplifier A current summing FIR filter can be implemented with multiple differential input stages and variable tail currents. The variable tail currents can be used to appropriately weight the present and...
73	7292092	Tunable poly-phase filter and method for calibration thereof A resonator circuit is shown that is fabricated with substantially identical elements disposed symmetrically along an axis such that the circuit has a linear response to bias current. The alignment...
74	7286002	Circuit and method for startup of a band-gap reference circuit A circuit and method for starting up a band-gap reference circuit. In one example, a startup circuit compares a Vbg voltage output of a band-gap reference circuit to a voltage (such as Vbe) across...
75	7279962	Frequency tuning loop for active RC filters A tuning loop which can tune the cut-off frequency of an active RC filter is disclosed. The cut-off frequency is determined by equivalent resistance and equivalent capacitance in an active RC...
76	7271648	Ladder filter, analog equalizer and signal readout system A ladder filter includes multiple inductor sections, each including voltage-controlled current sources and capacitors. A second signal input terminal is provided for the filter separately from an...
77	7271647	Active polyphase filter The present invention provides methods and apparatuses for a polyphase filter, comprising: a first and second cascoded differential amplifiers configured to receive a first and second differential...
78	7268615	Trap filter A trap filter comprises a delay circuit made up of switched capacitors for delaying an input signal and outputting a delay signal, and an adding circuit for adding the input signal and the delay...
79	7266351	Transconductance / C complex band-pass filter A complex filter such as the channel select filter in a radio transceiver is implemented using a transconductance/C topology to benefit from the ability to tune such filters and thereby stabilize...
80	7265609	Transconductor circuits A transconductor circuit, such as a gyrator filter, comprises an arrangement of balanced class AB transconductors, capacitors and floating MOS resistors formed by MOS transistors operating in their...
81	7260164	Efficient filtering of RxLOS signal in SerDes applications An efficient filter circuit and method for filtering a loss of receiver signal prevents false signals caused by glitches. The short glitches that happen at the positive edge of the clock signal may...
82	7256645	Suppression of noise in an integrated circuit Sub-circuits of an integrated circuit can act as noise sources on common conductors such as power supply lines and the substrate. Each of these conductors may act as a noise medium capable of...
83	7245186	Bandpass amplifier The present invention discloses a bandpass amplifier having gain and bandpass performance. The bandpass amplifier includes an input match unit for matching the gain of the amplifier and having a...
84	7239196	Filter circuit An R-2R resistor circuit network 12 used in a filter circuit according to the present invention has a path through which each branch current flows to a next integrating capacitor and a path...
85	7239197	Gm-C time constant tuning circuit A circuit including a Gm-C filter and an automatic Gm-C time constant tuning circuit is provided. The tuning circuit includes a reference conductor, a reference capacitor coupled to the reference...
86	7236051	Programmable glitch filter An apparatus and method for filtering glitches in data signals are provided. The apparatus and method provide a programmable glitch filter that may be programmed to filter glitches of different...
87	7233469	Components having actively controlled circuit elements Protection and filtering functions are provided for external circuits by internal circuits that use controlled elements.
88	7230476	Bipolar high impedance element A bipolar high impedance element comprises a p-n diode made from a compound semiconductor, and circuitry arranged to reverse-bias the diode such that the diode conducts a nearly constant...
89	7218170	Multi-pole current mirror filter A current mirror with selectable filter poles provides a selected low pass filtering function to a DC bias signal generated by the current mirror. Coupled between a first MOSFET and second MOSFET...
90	7215559	Method and apparatus to reduce common mode voltages applied to a load by a drive A method and apparatus for reducing common mode voltage applied to a load by a drive, the drive including a rectifier linked between three AC supply lines and positive and negative DC buses that...
91	7212068	Tunable Sallen-Key filter stage and filter assembly Disclosed is a filter circuit assembly that includes a filter stage with a variable resistor and a resistor/capacitor (RC) oscillator. A controlling output of the RC oscillator controls the value...
92	7205831	Noise filter circuit There is provided a noise canceling circuit that includes a first source terminal, a second source terminal, an output terminal, a reference voltage generator for generating a reference voltage, a...
93	7199651	Frequency selection using capacitance multiplication A variable capacitance circuit on an integrated circuit comprises a MOS transistor, and a capacitance multiplier connected to one end of a channel of the MOS device. A MOS device is formed in...
94	7196574	Active polyphase ladder filters with transmission zeros and their synthesis method Direct incorporation of transmission zeros into a continuous-time active complex BP filter transfer function yields a filter having much sharper roll-off than that of an all-pole filter. The ladder...
95	7196573	Systems and methods for creating complex poles Various devices, circuits and systems including filter sections for creating complex poles are described herein. For example, various circuits including transistors, tuning capacitors and resistors...
96	7193455	Programmable/tunable active RC filter A programmable/tunable active low-pass filter at least has the resistors, capacitors and shunt control devices. It uses the linear property of the MOSFET to implement the shunt control devices....
97	7187213	Semiconductor circuit The present invention provides a semiconductor circuit capable of effectively applying a filter function to both of L-level noise superimposed during originally H signal periods and H-level noise...
98	7180364	Filter apparatus including slave gm-C filter with frequency characteristics automatically tuned by master circuit In a filter apparatus includes a master circuit receiving a reference frequency to generate a control voltage, and a slave gm-C filter for receiving an input voltage to generate an output voltage....
99	7177612	Frequency generator and communication system using the same A frequency generator which can perform stable frequency oscillation unaffected by temperature variation. A frequency generator having a differential amplifier ( 1 ) having an LC resonance circuit...
100	7164311	Method and apparatus for tuning GMC filter A system and method for providing a tunable GMC filter is disclosed wherein a transconducted element having an attenuator in a feedback loop therewith is allowed to oscillate at a first oscillation...

Matches 51 - 100 out of 1256

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