Transconductor stage with controlled gain

Details Transconductor stage with controlled gain Transconductor stage with controlled gain

1995-05-31

1997-04-15

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330254, H03F 345

Patent

active

056213581

ABSTRACT:
A controlled gain transconductor (20) which comprises a transconductance stage (3) having at least two input terminals (I1, I2) and at least two output terminals (O1, O2), an active load (4) connected to the output terminals of the transconductance stage and a control circuit (5) for the active load (4) connected between said output terminals (O1, O2) and the active load (4).
Also provided is a circuit portion (10) being a replica of the transconductance stage (3), the active load (4) and the control circuit (5). This replicated portion (10) has an output connected to the control circuit (5) of the transconductor (20) to provide a predetermined voltage value (Vc) required for adjusting the DC gain of the device.

REFERENCES:
patent: 4342005 (1982-07-01), Harford
patent: 5057787 (1991-10-01), Arai et al.
patent: 5212455 (1993-05-01), Pernici et al.
J. H. Huijsing et al., "Low-Voltage Operational Amplifier with Rail-to-Rail Input and Output Ranges," IEEE Journal of Solid-State Circuits, vol. SC-20, No. 6, p. 1144 (1985).

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