High isolation/high speed buffer amplifier

Details High isolation/high speed buffer amplifier High isolation/high speed buffer amplifier

2006-01-03

2006-01-03

Shingleton, Michael B (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including current mirror amplifier

C330S264000, C330S301000, C327S052000, C327S053000, C327S108000, C327S109000

Reexamination Certificate

active

06982601

ABSTRACT:
A method and circuits of a high isolation and high-speed buffer amplifier capable to handle frequencies in the GHz range have been achieved. The output to input isolation is primary dependent on the gate-source capacitance of the active buffer transistor. Having two or more in series and by reducing the impedance between them a high isolation can be achieved. The input signals are split in several signal paths and are amplified in the push-pull mode using source follower amplifiers. Then the amplified signals are being combined again. The amplified output current is mirrored applying a multiplication factor. Said method and technology can be used for buffer amplifiers having differential input and differential output or having single input and single output or having differential input and single output. A high reversed biased (output to input) isolation and a reduced quiescent current have been achieved.

REFERENCES:
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patent: 6163222 (2000-12-01), Kobayashi
patent: 35313866 (1978-12-01), None
Mucha, “Fully Differential Current Conveyor based CMOS Operational Amplifier”, International Journal of Electronics 1994, vol. 74, No. 5, pp 697-703.

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