Matches 1 - 50 out of 238 1 2 3 4 5 >
Match Document Document Title
7560982 Apparatus for reducing apparent capacitance in high frequency filter for power line  
An Op amp circuit is used to provide higher capacitance to a power network to remove unwanted high frequency components from the power signal. At the primary power line frequency, a lower...
7521991 Balanced band-pass filter for radio receivers  
A filter includes an input and an output. First and second filter stages having respective stage inputs and stage outputs are connected in cascade between the input and the output. Each filter...
7521990 Noise reduction circuits  
A noise reduction circuit for AC power, AC power neutral lines, and DC power. In a first embodiment for use with AC power, the invention operates by subtracting the error voltage from an incoming...
7511570 Transconductance filtering circuit  
A transconductance filtering device with a flexible architecture that can selectively present a different topology and/or order beginning with the same initial structure is disclosed. For example,...
7498871 Spectrum spreaders including tunable filters and related devices and methods  
A spectrum spreader may include a signal conductor and a tunable filter. The signal conductor may be configured to receive a clock signal having a clock signal frequency. The tunable filter may be...
7486338 Fully integrated terrestrial TV tuner architecture  
A TV tuner consisting of a least one low-noise amplifier, one mixer and one variable-gain amplifier plus two band-pass filters, the first of which is placed after low-noise amplifier and before the...
7463086 Apparatus and method for tuning a band pass filter  
A tunable band pass filter is provided. The tunable band pass filter includes a band pass filter and a plurality of switches coupled to the band pass filter. The band pass filter includes a...
7463084 Method and device for suppressing variation of DC level of signal reproduced from optical storing media  
The present invention provides a filtering device for high-pass filtering a signal reproduced from an optical data storage medium and a method for the same. More particularly, the present invention...
7436250 Highly selective filtering device and corresponding filtering method  
The invention proposes a filtering device having a frequency response which is symmetrical, using asymmetrical filters coupled by transposition means. The advantageous characteristics of the...
7429889 Control system for programmable filters  
Control system for programmable filters, master-slave calibration system and fully programmable high precision filter for use in such control system, such filters being provided with a filter input...
7417495 Reconfigurable frequency filter  
There are various mobile communication standards such as GSM, EDGE, and W-CDMA. For a GSM or EDGE system, a receiver must be configured to work with an IF signal with a center frequency and...
7372323 Resonance limiter circuits for an integrated circuit  
In one embodiment, an integrated circuit comprises resonance limiter circuits coupled to a power supply connection of the integrated circuit. The resonance limiter circuits are configured to detect...
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...
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...
7308241 Receiver system  
A conventional receiver system has a filter circuit with unsatisfactory gain characteristics, and thus does not offer satisfactory reception performance. A receiver system of the invention has a...
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...
7248103 Complex band-pass filter  
A complex band-pass filter. The complex band-pass filter includes a band-pass filter coupled to a voltage source. The band-pass filter includes a first plurality of transconductors that receives a...
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...
7245178 Analog filter circuit and adjustment method thereof  
An analog filter circuit in which filter characteristic deviation can be adjusted with simple circuitry and its adjustment method can be provided. The analog filter circuit includes a low pass...
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...
7098731 Synthesis method for an active polyphase filter  
A fully-integrated continuous-time active complex bandpass IF filter that may contain transmission zeros yielding much sharper roll-off than that of an all-pole filter is implemented using...
7081788 Band pass filter  
A band pass filter includes a first band pass filter constructed of a biquad circuit and having a first center frequency, and a second bandpass filter constructed of a biquad circuit and having a...
7061310 All-pass filter circuit  
An all-pass filter circuit includes a first terminal to which an input signal is input, a capacitor having a first electrode connected to the first terminal and a second electrode, a current...
7023245 Versatile charge sampling circuits  
A charge sampling circuit, has a control signal generator for controlling an analog input signal to the charge sampling circuit to be integrated by an integrator during a sampling phase responsive...
7002417 RC and SC filter compensation in a radio transceiver  
Disclosed is apparatus for operating with an RC filter ( 26, 26 A), and a corresponding method. The apparatus includes circuitry ( 32 ) for use in measuring an actual value of at least one filter...
6995605 Resonance suppression circuit  
A resonance suppression circuit is provided to suppress resonance on a power grid of a chip or die. The resonance suppression circuit may include a band-pass filter portion, a comparator portion,...
6980049 Polyphase-notchfilter  
The invention relates to a Polyphase-Notchfilter for filtering input signals comprising known bandpass filters, which comprise voltage-controlled current sources. To provide an integrated circuit...
6930544 Filter  
The object of the present invention is to obtain a high precision notch filter or all-pass filter. Therefore, two transconductance circuits for adjustment, which perform a voltage-current...
6838946 Circuit and method for adjusting circuit tolerances  
A frequency response adjuster for a frequency responsive circuit, and a method for tuning a frequency response of a circuit, are disclosed. The adjuster may include a time constant sensor, wherein...
6836180 Poly-phase network with resonant circuit bandpass shaping  
An R-C polyphase network that provides bandpass shaping and amplification to maintain the quadrature phase output is provided. In one implementation, a polyphase device comprises two transistors...
6816005 All pass filter  
An all pass filter capable of adjusting a center frequency and Q independently from one another, even in a high frequency band. In the filter, an input signal from an input terminal is applied to a...
6813484 Voltage controlled band-pass filter  
A voltage controlled band-pass filter is in a phase locked loop. The output from a phase detector is applied through a loop filter as the control voltage. The phase detector output is proportional...
6791402 Tunable integrated RF filter having switched field effect capacitors  
A filter ( 3 ) is described, which filter is provided with field effect (FET) capacitors (M 1-32 ; M′ 1-32 ) arranged for controlling their respective capacity values, each such FET capacitor (M...
6608898 Band pass and notch filters for echo reduction with less phase distortion  
A complementary comb filter includes a plurality of band pass filters and a plurality of notch filters, wherein the notch filters have the same center frequencies as the band pass filters or the...
6538499 Low jitter transmitter architecture with post PLL filter  
A post PLL filter is coupled to the output terminal of a phase locked loop. The post PLL filter reduces the jitter of the PLL output clock signal by increasing the Q of the phase locked loop. In...
6492865 Band pass filter from two filters  
A band pass filter includes a pair of filters having different center frequencies and a difference amplifier coupled to the outputs of the filters. The filters preferably have response curves that...
6489838 Apparatus and method for equalizing received network signals using a single zero high-pass filter having selectable impedance  
A network line equalizer includes a transconductance-controlled, tunable single zero high-pass, filter that includes a single zero impedance circuit, and first and second MOS transistors that...
6466067 PLL circuit with shortened lock-up time  
BPF having a band width of |reference signal f REF -mixer output signal f MIX OUT | is connected to a phase comparator. When an output signal corresponding to the passage of this band width has...
6429733 Filter with controlled offsets for active filter selectivity and DC offset control  
A filter is disclosed that actively controls one or more filter characteristics, such as the cut-off frequency of a selected filter pole, while minimizing the value of selected filter components...
6420927 Filter and hold circuit utilizing a charge/discharge current  
The subject invention pertains to a method and circuit design particularly useful for long time constant RC active or passive circuits in either continuous or discrete time domains. The subject...
6404279 Band pass filter with improved group delay  
An electrical signal is applied to a band pass filter, a first notch filter, and a second notch filter in any order. The center frequencies of the notch filters straddle the pass band of the band...
6404278 Separation of plural band pass filters  
The separation of a adjacent band pass filters is improved, without changing the filters, by inverting the output signals from alternate filters and not inverting the remaining output signals. All...
6356143 Method and apparatus for filtering radio frequency signals  
A variable bandpass filter system passes a selected range of frequencies while rejecting other frequencies in an RF input signal. The system includes a switch and an oscillator. The switch receives...
6268766 Band pass filter from two notch filters  
A band pass filter includes a pair of notch filters having different notch frequencies and a difference amplifier coupled to the outputs of the notch filters. The notch filters preferably have...
6194959 Active filter circuit  
A filter circuit includes two current amplifiers and two capacitors constituted of MOS or MIS transistors. An output terminal of the first current amplifier is connected to an input terminal of the...
6188272 Filter circuit  
Provided is a circuit arrangement for attaining an all-pass filter characteristics which have been conventionally attained by bipolar transistors, by using MIS transistors. An alternating-current...
6181197 Bandpass filter with transconductors  
A bandpass filter includes a first and a second transconductor. The first transconductor has a first input connected to ground, and a second input connected to a second input of the second...
6169447 Stabilization of passband active filters  
A calibrator for stabilization of a passband active filter firstly sets a low level of filter supply current to assure filter stability while the filter is tuned to the required passband. The...
6157248 Active filter circuit  
An active filter circuit (a band stop filter type or a band pass filter type) having high Q value and high efficiency and which is suitable for integration has an input signal vi inputted from the...
6137353 Linearized integrated FM demodulator using a plurality of cascaded all-pass filters or a bessel filter  
An approach for demodulating a frequency-modulated signal involves processing a frequency-modulated signal with a phase shifter network to provide a demodulated signal that has a relatively...
Matches 1 - 50 out of 238 1 2 3 4 5 >