Miscellaneous active electrical nonlinear devices – circuits – and – Specific input to output function – Combining of plural signals
Patent
1997-09-12
1999-06-01
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific input to output function
Combining of plural signals
327563, 327357, 327349, 330253, H03F 345
Patent
active
059091363
ABSTRACT:
A four-quadrant multiplier which is constructed from two squaring circuits using the quarter-square technique and is suitable for an integrated circuit (IC) or a large-scale integrated circuit (LSI). Each of the squaring circuits has a pair of differential input terminals, an output terminal and two differential pairs. Each of differential pairs is composed of first and second transistors whose sources or emitters are connected in common, receives a differential input voltage impressed between the differential input terminals. In each differential pair, a constant current source of a predetermined current value and an dynamic bias current source are inserted in parallel between the common sources or the common emitters and the grounding point. The dynamic bias current source is realized by a current mirror circuit which outputs current equal to the drain current or the collector current of the second transistor. Therefore, the tail current of each differential pair is current given by the sum of the output current of the second transistor and the predetermined constant current. The output current of each squaring circuit is represented by the sum of the drain currents or the collector currents of the second transistors of both of the differential pairs.
REFERENCES:
patent: 4965528 (1990-10-01), Okanobu
patent: 5107150 (1992-04-01), Kimura
patent: 5151625 (1992-09-01), Zarabadi et al.
patent: 5187682 (1993-02-01), Kimura
patent: 5357149 (1994-10-01), Kimura
patent: 5381113 (1995-01-01), Kimura
patent: 5438296 (1995-08-01), Kimura
patent: 5481224 (1996-01-01), Kimura
patent: 5485119 (1996-01-01), Kimura
patent: 5500623 (1996-03-01), Kimura
patent: 5523717 (1996-06-01), Kimura
patent: 5552734 (1996-09-01), Kimura
patent: 5576653 (1996-11-01), Kimura
patent: 5578965 (1996-11-01), Kimura
patent: 5581210 (1996-12-01), Kimura
"Microelectronic Circuits", Sedra and Smith, third edition, pp. 220-223 and 308-312, 1991.
"CMOS Temperature-Stable Linearised Differential Pair", Dias et al., Electronics Letters, vol. 28, No. 25, Dec. 1992.
"Linearity Improvement of CMOS Transconductors for Low Supply Applications", Chen et al., Electronics Letters, vol. 29, No. 12, Jun. 1993.
IEEE Journal of Solid-State Circuits,"Adaptive Biasing CMOS Amplifiers"; Degrauwe et al., vol. SC-17, No. 3, Jun. 1982.
"A Unified Analysis of Four-Quadrant Analog Multipliers Consisting of Emitter and Source-Coupled Transistors Operable on Low Supply Voltage"; IEICE Transactions on Electronics E76-c(1993) May, No. 5, Katsuji Kimura, May 1993.
Katsuji Kimura, "A Dynamic Bias Current Technique for a Bipolar Exponential-Law . . . Supply Voltage", IEICE Trans. Fundamentals, vol. E77-A, No. 11, Nov., 1994, pp. 1922-1928.
Katsuji Kimura, "A Unified Analysis of Four-Quadrant . . . Operable on Low Supply Voltage", IEIEE Trans. Electronics, vol. E76-C, No. 5, May, 1993, pp. 714-738.
Callahan Timothy P.
NEC Corporation
Shin Eunjia
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