Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1994-01-25
1995-12-12
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327 65, 327563, H03K 522
Patent
active
054753236
ABSTRACT:
An integrated circuit apparatus and method is provided for utilizing voltage dividers and differential amplifiers. An apparatus and method for dividing a voltage with a resistor voltage divider and for employing the voltage divider in an integrated circuit. The resistor voltage divider utilizes inaccessible compensation taps that are placed between nonlinearly spaced output taps. The compensation taps reduce the impact of tap resistance on the voltage divider transfer function. The number of inaccessible compensation taps placed between output taps is dependant upon a chosen tap density that is substantially maintained across the body of the resistor voltage divider. The resistor may be used in integrated circuits employing amplifiers, such as volume control circuitry. A differential amplifier is provided with an input common mode feedback loop that compensates for signal distortion due to a common mode signal. The effects that mode changes in the input transistors have on the differential gain are minimized by the input common mode feedback loop. The differential signal path has only one low frequency mode. The amplifier includes circuitry that acts on the input differential signal and circuitry that acts on the varying input common mode voltage. The common mode feedback is achieved using a variable current sink transistor. The gate voltage of the variable current sink transistor is controlled by the sum of currents flowing through transistors that are connected to the drains of the differential input transistors.
REFERENCES:
patent: 3666995 (1972-05-01), Wensink et al.
patent: 3868846 (1975-03-01), Kushida et al.
patent: 4028642 (1977-06-01), Kushida et al.
patent: 4028718 (1977-06-01), Migitaka et al.
patent: 4147943 (1979-04-01), Peterson
patent: 4181878 (1980-01-01), Murari et al.
patent: 4245209 (1981-01-01), Bertotti et al.
patent: 4468628 (1984-08-01), Gross
patent: 4496911 (1985-01-01), Lenz
patent: 4573020 (1986-02-01), Whatley
patent: 4658159 (1987-04-01), Miyamoto
patent: 4868417 (1989-09-01), Jandu
patent: 4887048 (1989-12-01), Krenik et al.
patent: 4901031 (1990-02-01), Kalthoff et al.
patent: 4916338 (1990-04-01), Metz
patent: 4933644 (1990-06-01), Fattaruso et al.
patent: 4962323 (1990-10-01), Ta
patent: 5187448 (1993-02-01), Brooks et al.
patent: 5239210 (1993-08-01), Scott
Plaza, "Power-Supply Rejection in Differential Switch Capacitor Filters", (FIG. 3), IEEE 1984, pp. 912-918.
Dallas Semiconductor Part Data Sheets, DS1666, DS1666s Audio Digital Resistor, pp. 1-5, 1992, printed in USA.
Dallas Semiconductor Part Data Sheets, DS1267 Dual Digital Potentiometer Chip, pp. 750-757, 1990, printed in USA.
Toshiba Parts Data Sheets, TC9176P and TC9177P Audio Digital IC, p. 437 and 13 pages, date and place of printing unknown.
Crystal Semiconductor Corporation, Stereo Digital Volume Control Preliminary Product Information, pp. 1-11, Nov., 1992, printed in USA.
Ting, Chung-Yu, and Chen, Charles Y., "A Study of the Contacts of a Diffused Resistor," Solid State Electronics, 14:433-438, published in Europe.
Dialog Search Report dated Feb. 28, 1993, printed in USA.
SGS-Thomson Microelectronics, TDA7318, Digital Controlled Stereo Audio Processor, Advance Data, pp. 727-737, May 1991, printed in USA.
Williamsen, Mark, "Digitally Controlled am;plfier Takes 1-dB Steps," Electronic Design News (EDN), pp. 210 and 212, May 7, 1992, published in USA.
Analysis and Design of Analog Integrated Circuits, 2nd Ed., pp. 752-755, Paul Gray and Robert Meyer (1984) printed in USA.
Harris Larry L.
Scott, III Baker P. L.
Crystal Semiconductor Corporation
Tran Toan
LandOfFree
Amplifier with input common mode compensation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Amplifier with input common mode compensation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Amplifier with input common mode compensation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1362491