Merged current clamp in triple-input transconductor, for use in

Details Merged current clamp in triple-input transconductor, for use in Merged current clamp in triple-input transconductor, for use in

1990-10-31

1992-03-03

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

330253, 331111, 331135, 331177R, H03B 524

Patent

active

050936344

ABSTRACT:
A clamped linear transconductance amplifier path, consisting essentially of a current clamp merged in a linear transconductance amplifier path, is used in a triple-input, triple-output transconductor (200). In a balanced transconductor in CMOS technology, this clamped linear transconductance amplifier path is formed by a p-channel MOS transistor (M23) separately connected in series with each of a matched pair of p-channel MOS transistors (M21,M22). The clamped linear transconductance amplifier path, together with two other transconductance paths (M15-M20; M9-M14), can be interconnected to form the input side of the triple-input, triple-output transconductor (200). By summing and integrating the outputs of the input side of the triple-input transconductor (200), the output (V.sub.OUT,P and V.sub.OUT,N) of the output side of the transconductor can be formed. By feeding back this output to the input side of the transconductor (200), an oscillator can be obtained.

REFERENCES:
patent: 4405900 (1983-09-01), van de Plassche
patent: 4897612 (1990-01-01), Carroll
patent: 5025231 (1991-06-01), Schwartzbach
Linares-Barranco, B. et al, "Very High Frequency CMOS OTA-C Quadrature Oscillators," Proc. IEEE/ISCAS 1990, May 1-3, 1990, New Orleans, La., pp. 3189-3192.

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