Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1998-08-12
1999-12-07
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330253, 330257, H03F 345
Patent
active
059990554
ABSTRACT:
A tunable CMOS OTA is provided, which improves the transconductance linearity with a simple circuit configuration. This OTA is comprised of (a) a differential input pair of first and second MOSFETs, (b) a first resistor connected to sources of the first and second MOSFETs, (c) a current source/sink for supplying/sinking a variable driving current to the differential input pair, and (d) an output circuit for the differential input pair. A differential input voltage is applied across gates of the first and second MOSFETs to generate a first pair of differential output currents. The current flowing through the first resistor is proportional to the applied differential input voltage. The first pair of differential output currents are applied to drains of third and fourth MOSFETs of the output circuit, respectively, thereby generating a first bias voltage at the drain of the third MOSFET and a second bias voltage at the drain of the fourth MOSFET. The first and second bias voltages generate a current flowing through the second and third resistors, which is proportional to the applied differential input voltage. A differential output current of the OTA is derived from the difference between the second pair of differential output currents flowing through the third and fourth MOSFETs of the output circuit, respectively.
REFERENCES:
patent: 4749957 (1988-06-01), Tsividis
patent: 5774020 (1998-06-01), Kimura
patent: 5896063 (1999-04-01), Marsh et al.
NEC Corporation
Nguyen Khanh Van
Pascal Robert
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