Amplifiers – With periodic switching input-output
Patent
1992-10-21
1994-08-30
Mottola, Steven
Amplifiers
With periodic switching input-output
330295, 330308, H03F 114, H03F 308
Patent
active
053431600
ABSTRACT:
A circuit is provided that solves the problem of implementing a fully balanced (differential) transimpedance amplifier with low-noise and wide bandwidth. This is accomplished by direct coupling the feedback resistors from the outputs of the amplifier to the inputs without the use of a blocking capacitor. The low frequency response is thereby improved and the problems created by a DC bias resistor that degrades the noise performance and, in some case, restricts the dynamic range (caused by pulse width distortion for large signals) are eliminated. The amplifier achieves higher voltage gain than prior designs and also results in lower noise and wider bandwidth. The differential nature of the amplifier provides good power supply rejection. While the preferred embodiment is particularly well-suited to GaAs MESFET technology, the invention can also be applied to silicon bipolar and MOS technology.
REFERENCES:
patent: 4808942 (1989-02-01), Milkovic
patent: 5095286 (1992-03-01), Cole et al.
Mottola Steven
Triquint Semiconductor, Inc.
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