| Patent Number |
Title Of Patent |
Date Issued |
| 5869986 |
Power level sense circuit |
February 9, 1999 |
| A power level sense circuit which is substantially immune to variations in integrated circuit processing and operating temperature. The sense circuit uses a diode biased to a predetermined average conduction level as the primary element in an envelope detector to detect the envelope of t |
| 5748010 |
Logic signal level translation apparatus having very low dropout with respect to the powering ra |
May 5, 1998 |
| A logic signal level translation method and apparatus having very low dropout with respect to the powering rails and having a tri-state mode of operation allowing the output terminal to be driven to voltages beyond the highest supply voltage coupled thereto without significant power |
| 4801888 |
Programmable, universal filter with self biasing |
January 31, 1989 |
| 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. A first capacitor has one of its terminals coupled to a first of the input terminals of th |
| 4596954 |
Frequency doubler with fifty percent duty cycle output signal |
June 24, 1986 |
| A unique frequency doubler circuit is utilized which requires only a handful of standard components such as operational amplifier, logic gates, resistors, capacitors and switches. In contrast to certain prior art frequency doublers, frequency doublers constructed in accordance with the |
| 4590440 |
Phase locked loop with high and/or low frequency limit detectors for preventing false lock on ha |
May 20, 1986 |
| A phase locked loop circuit (16) includes means to eliminate harmonic frequency locking. The phase locked loop includes a voltage controlled oscillator (1) which provides an output signal (V.sub.out) which is compared with the input signal (V.sub.in) by a phase detector (4). The outp |
| 4580065 |
Single-shot circuit having process independent duty cycle |
April 1, 1986 |
| A single-shot circuit is fabricated as an integrated circuit except for a single capacitor requiring a single pin to connect to the on-chip circuitry. The single-shot is rendered independent of process variations and operating conditions by incorporating an analog feedback loop. The |
| 4554508 |
Carrier detection circuit |
November 19, 1985 |
| A carrier detection circuit includes a rectification stage, an integrator, a comparator, and a digital counter. By utilizing a digital counter, long time constants are provided without the use of external components. If desired, a mark detect circuit is used when a mark must be present t |
| 4540949 |
Reference voltage circuit including a three-terminal operational amplifier with offset compensat |
September 10, 1985 |
| An operational amplifier has one noninverting input lead (116), and two inverting input leads (117a, 117b). One of these inverting input leads (117a) is utilized to compensate for the effects of the inherent offset voltage (V.sub.off) of the operational amplifier, and the second invertin |
| 4475170 |
Programmable transversal filter |
October 2, 1984 |
| A programmable transversal filter utilizes a plurality of programmable multiplying means. The result of each multiplication is summed by a summing circuit, thus providing an output signal. The delay network comprises a plurality of signal sample and hold circuits which are selectivel |
| 4470126 |
Programmable transversal filter |
September 4, 1984 |
| A programmable transversal filter (10) utilizes a plurality of programmable multiplying means (M.sub.1 -M.sub.4). The result of each multiplication is summed by a summing circuit (7), thus providing an output signal (y(t)). The delay network of this invention comprises a plurality of sam |
| 4460874 |
Three-terminal operational amplifier/comparator with offset compensation |
July 17, 1984 |
| An operational amplifier has one noninverting input lead (116), and two inverting input leads (117a, 117b). One of these inverting input leads (117a) is utilized to compensate for the effects of the inherent offset voltage (V.sub.off) of the operational amplifier, and the second invertin |
| 4441082 |
Switched capacitor automatic gain control loop |
April 3, 1984 |
| An AGC circuit (12) contains a programmable gain stage comprising an operational amplifier (150) and one or more capacitor arrays (101, 121) for controlling the closed loop gain of the operational amplifier. The output signal (V.sub.O) of this operational amplifier is rectified, and |
| 4438354 |
Monolithic programmable gain-integrator stage |
March 20, 1984 |
| A switched capacitor gain stage (110, 120) having a programmable gain factor. This gain factor is determined by the connection of desired gain determining components (14-17; 25-28) contained within a component array (100, 101). A sample and hold circuit (46) is provided for the storage o |
| 4431986 |
Digital to analog and analog to digital converters with bipolar output signals |
February 14, 1984 |
| A digital to analog converter (100) utilizes a current mirror connected to a reference voltage (V.sub.REF) to generate a constant reference current (I.sub.REF). A voltage divider (R.sub.1 and R.sub.2) is used in conjunction with a plurality of MOS transistors (X.sub.1 -X.sub.N) serving |
| 4431971 |
Dynamic operational amplifier |
February 14, 1984 |
| A unique dynamic operational amplifier is constructed utilizing a switched capacitor (25) as the biasing means, wherein the switched capacitor biasing means is capable of effectively doubling the power supply voltage supplied to the dynamic operational amplifier, thus greatly extending t |
| 4365204 |
Offset compensation for switched capacitor integrators |
December 21, 1982 |
| An integrator circuit utilizing an operational amplifier and switched capacitor elements in place of resistors in such a manner as to provide compensation for voltage offsets present in the operational amplifier resulting in an output voltage free from the effects of voltage offsets |
| 4335355 |
CMOS Operational amplifier with reduced power dissipation |
June 15, 1982 |
| An operational amplifier (10a) comprised of MOSFET elements is disclosed which provides for a variable drive for an output stage that results in lower power dissipation and increased gain factor over comparable circuits using constant bias drive for the output stage. A bias section (14) |
| 4320347 |
Switched capacitor comparator |
March 16, 1982 |
| An operational amplifier is designed to eliminate the effects of inherent voltage affects when used as a voltage comparator, while maintaining a high slew rate and a fast response time by providing a feedback capacitor which can be connected and disconnected between the output terminal a |
