Matches 201 - 250 out of 507 < 1 2 3 4 5 6 7 8 9 10 11 >
Match Document Document Title
4801888 Programmable, universal filter with self biasing  
The invention relates to a self-biasing, programmable, universal active filter having an input section which includes an operational amplifier. The amplifier has one output and two input terminals....
4795987 Parasitic insensitive switched capacitor filter  
A switched capacitor filter includes an amplifier in a feedback or feed-forward path thereof. The amplifier (A5, C6, S7,) has a gain dependent on the ratio of stray capacitances to the capacitors...
4783635 Low pass filter circuit  
A low pass filter circuit for filtering out high frequency AC components from an electric signal including a DC component and possibly low frequency AC components is disclosed herein. This circuit...
4782305 Differential input-single output two pole filter implemented by a single amplifier  
An analog two pole filter is provided which uses a single amplifier to implement a predetermined transfer function. The filter has a differential input and converts the two inputs to a single...
4779056 Active filter  
A filter comprises an amplifier circuit arrangement having a signal input (1) and a signal output (8) and a coupling (36) between a point (37) on a signal path (39) to the signal input and a point...
4767998 Active filter using low gain amplification stages  
A high frequency active filter is presented having an amplifier having an en loop gain between one and three which is provided with appropriate electrical components of appropriate values for...
4763081 Reducing distortion in active MOSFET-C low pass filters  
A predistortion network preceding a continuous-time active MOSFET-C lowpass filter cancels the inherent distortion of the filter over a large portion of its passband. The lowpass filter has...
4760346 Switched capacitor summing amplifier  
A switch capacitor summing amplifier is disclosed having a coupling means to couple desired signals to the active amplifier in response to an enable signal. The coupling is performed in synchronism...
4755771 Equalizing circuit  
An equalizer circuit for equalizing a signal attenuated in frequency while the same is transmitted through a transmission line and eliminates out-band high frequency noise so as to provide a signal...
4751562 Field-effect semiconductor device  
A field-effect semiconductor device including a through-hole electrode formed so as to penetrate from the top to the bottom of the semiconductor substrate, a dielectric film formed on the...
4713627 Active filter with bootstrapping  
An active low-pass filter especially suitable for inclusion in an integrated circuit and capable of operating at frequencies up to at least f T /β of transistors within the filter. A bootstrap...
4710726 Semiconductive MOS resistance network  
A circuit useful as a voltage tunable resistive element comprises four matched MOS transistors in which each of the first and second have their drains interconnected to a first input terminal and...
4697152 Fully differential switched capacitor amplifier having autozeroed common-mode feedback  
A fully differential amplifier which is compensated for both input offset voltage error and output common-mode variation is provided. The differential amplifier provides two very accurate output...
4686486 Active filter having series resonant active filter terminated by parallel resonant active filter  
A fourth (or higher) order filter has a series resonant section terminated by a parallel resonant section, both based on frequency dependent negative resistance (FDNR). The FDNR, resistance and...
4683441 Apparatus for establishing the differences between multiple pairs of analog input signals  
A bank of differential amplifier circuits includes specialized circuits to provide multi-channel differencing with a minimum number of active devices such that the differences between pairs of...
4675616 Second order all pass network  
A second order all pass network for wide-band signals, and comprising second and third voltage-current converting circuits with their respective positive input terminals supplied with input signals...
4663597 RC coupling filter, especially an input filter, for receivers of centralized ripple control systems  
A RC coupling filter, especially an input filter for receivers of centralized ripple control systems, with at least two similar active RC four terminal networks with at least one amplifier each,...
4656429 Voltage comparison circuit with ripple component elimination  
A voltage comparison circuit having an amplification circuit which includes an inverting amplifier and a switching MOS transistor for setting an operation point of the inverting amplifier connected...
4647865 Parasitic insensitive switched capacitor input structure for a fully differential operational amplifier  
An input structure which is parasitic insensitive and allows a fully differential amplifier to receive a single input voltage while maintaining a predetermined common-mode input voltage is...
4644304 Switched-capacitor pseudo-n-path filter  
A switched capacitor pseudo-N-path filter stage includes an analog integrator circuit having an input, an output, and a feedback capacitor connected between the input and the output. A plurality of...
4644306 Programmable electronic synthesized capacitance  
A predetermined and variable synthesized capacitance which may be incorporated into the resonant portion of an electronic oscillator for the purpose of tuning the oscillator comprises a...
4636738 Parasitic compensated switched capacitor integrator  
A switched capacitor integrator for receiving a single input signal is compensated for parasitic capacitance errors with a minimum amount of circuitry. Although a single-ended amplifier is...
4633189 NF tone control circuit  
An NF (Negative Feedback) tone control circuit in which a circuit gain of unity is maintained for a flat frequency response without the addition of active components. A voltage divider circuit...
4607231 Variable switched-capacitor filter capable of changing the filter characteristic thereof  
An equalization circuit with switched capacitor filters, each having variable filter characteristics, that is adapted to provide power equalization on digital transmission lines that are subject to...
4604584 Switched capacitor precision difference amplifier  
A circuit which can selectively sample and hold two real time input voltages and provide an output voltage indicating the difference value of the input voltages is provided. A switched capacitor...
4593250 Operational amplifier compensation technique for biquadratic notch active filters  
An active biquadratic notch filter having first integrating circuitry for providing a first integration signal and further having second integrating circuitry responsive to the first integration...
RE32132 Video signal play-back circuit  
In a video signal play-back circuit connected so that a play-back signal from a magnetic head may be applied to an amplifier circuit through a resonance circuit which consists of an inductance...
4581588 Switchable bandpass filter  
A bandpass filter suitable for use in modem circuitry and other applications which require the filter's center frequency to be switched is disclosed. The filter circuit has the characteristic that...
4581587 Solid state electrical musical instrument amplifier  
A solid state electrical instrument amplifier includes an instrument signal input, a preamplifier, and circuitry in association with the preamplifier and preferably in a feedback loop of the...
4580103 Amplifier circuit arrangement for eliminating input signal offset in the output  
In a semiconductor integrated circuit comprising an amplifier for detecting the presence of a carrier on an incoming wave signal, in order to suppress dc offset in the incoming wave and at the same...
4563652 Dual-stage filter with feedback  
A dual-stage band pass-band reject filter with feedback. Two state variable band pass filters with identical topology are cascaded as first and second stages. Each stage employs two inverting...
4559498 Symmetrical integrator and application of said integrator to an electric filter  
The symmetrical integrator comprises an operational amplifier having two floating inputs and two floating outputs each having a feedback connection to an input via a capacitor. An input capacitor...
4555668 Gain amplifier  
A novel switched capacitor gain stage uses a unique circuit design and clocking technique that reduces the component mismatch offset voltage and the clock-induced feedthrough offset voltage...
4553103 RC-Active filters  
Second and third-order RC active filter sections are described both based on a similar basic twin-tee network. The circuits include a single operational amplifier and are such that the poles and...
4551683 Switched capacitor filter circuit  
Disclosed is a switched capacitor filter circuit employing the equivalent resistance of a switched capacitor circuit as the resistive element in a frequency dependent impedance converting circuit.
4551686 Coupling filter, especially an input filter, for receivers of centralized ripple control systems  
A coupling filter is formed from a plurality of four terminal networks. Each active four terminal network preferably has a bypass admittance, two filter admittances, a feedback admittance, and an...
4543536 Charge amplifier with automatic zero  
A charge amplifier includes an operational amplifier having first and second voltage dividers across its output connected to a capacitor and a resistor, respectively, in an R-C network returned to...
4539525 Band-pass amplifier filters  
A two-stage band-pass amplifier filter circuit which uses a bi-quad amplifier in each stage, the bi-quad amplifier being connected between an AC feedback amplifier in the signal transmission path...
4524332 Integrated notch filter  
A notch filter is provided having a low-pass section and a summing section which are capable of being integrated on a single semiconductor chip. The summing section provides an output signal which...
4524425 High-pass filter of the first order and application thereof to telephony  
A sampled first order high pass filter having a configuration that eliminates the output offset voltage normally associated with known filters of this general type. It is constructed according to...
4523107 Switched capacitor comparator  
A switched capacitor comparator having two or more stages of differential input operational amplifiers utilizing sequentially switched feedback portions and feedback capacitors is provided. The use...
4511851 Method and apparatus for obtaining small fractional units of capacitance  
A method and apparatus for obtaining small fractional units of capacitance in amplifier circuits using units of capacitance which may be accurately ratioed is provided. Several embodiments are...
4509019 Tunable active filter  
A tunable high-pass or low-pass filter employs a balanced amplifier having electronically controlled elements in either the two input or the two feedback paths (or both). A reactive element is...
4502019 Dynamic amplifier circuit  
A dynamic amplifier circuit, specifically for switched-capacitor filters, having a current source which supplies an exponentially-decreasing bias current. In addition, a current source is included...
4502017 Operational amplifier having frequency compensation  
An operational amplifier with frequency compensation is described. The amplifier includes a first amplifier with a low-impedance output followed by a transconductance amplifier with a capacitive...
4496858 Frequency to voltage converter  
A frequency to voltage converter is described which utilizes an operational amplifier connected as a damped integrator and having a switched capacitive input and feedback element. If the capacitors...
4494551 Alterable frequency response electrocardiographic amplifier  
An electrocardiographic amplifier having an integrator in the feedback loop between the amplifier's input and output whose time constant is varied by the duty cycle of a series switch to vary the...
4492931 Infra-red receiver front end  
An infra-red receiver front-end includes a trans-impedance amplifier connected to receive an input current and provided with frequency selective transadmittance feedback between its output and...
4491802 Wide-band amplifier system  
A system suitable for the amplification of wide-band signals, with frequencies from zero to the gigahertz order, for oscilloscopic observation or recording. Included are first and second amplifier...
4484146 Differential amplifier containing a low-pass filter  
A differential amplifier which incorporates at its preceding stage resistances and condensers combined with each other and serving as a low-pass filter, thereby omitting a conventional low-pass...
Matches 201 - 250 out of 507 < 1 2 3 4 5 6 7 8 9 10 11 >