Device for pole splitting in amplifiers

Details Device for pole splitting in amplifiers Device for pole splitting in amplifiers

1997-12-09

1999-11-23

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including signal feedback means

330 85, H03F 134

Patent

active

059907495

ABSTRACT:
A novel device for pole splitting which can be employed in multistage amplifiers having a final stage and a prior stage. The device comprises a first capacitor connected between the output of the prior stage and the output of the final stage, a source follower, and a second capacitor connected between the output of the prior stage and the source follower. The source follower provides an offset voltage that reduces variation of the total capacitance of the first and second capacitors. In a preferred version of the present invention, the first and second capacitor each comprise a MOSFET transistor having a certain threshold voltage. The offset voltage is set to be at least the threshold voltage of the MOSFET transistors. In a preferred version, the source follower comprises a plurality of MOSFET transistors, which includes a MOSFET transistor having a gate connected to the first capacitor and a source connected to the second capacitor.

REFERENCES:
patent: 5828264 (1998-10-01), Koifman et al.
patent: 5838199 (1998-11-01), Nakamura

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