Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1997-05-30
1999-06-15
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327560, 327563, 330252, H03B 100, H03K 500, H04B 110
Patent
active
059125829
ABSTRACT:
A BiCMOS transconductor differential stage for high frequency filters includes an input circuit portion having signal inputs and a pair of MOS transistors having their respective gate terminals corresponding to the signal inputs. The differential stage has an output circuit portion having signal outputs and a pair of bipolar transistors connected together with a common base inserted between the inputs and the outputs in a cascode configuration. The differential stage includes a switching device associated with at least one of the bipolar transistors to change the connections between parasitic capacitors present in the differential stage. The switching device also has at least one added bipolar transistor connected in a removable manner in parallel with the corresponding bipolar cascode transistor. In a variant differential stage, there are also provided respective added MOS transistors connected in parallel with the MOS transistors of the input circuit portion to change the ratio W:L of each of the MOS transistors.
REFERENCES:
patent: 3898583 (1975-08-01), Shuey
patent: 4390850 (1983-06-01), Davis et al.
patent: 5061862 (1991-10-01), Tamagawa
patent: 5162668 (1992-11-01), Chen et al.
patent: 5223743 (1993-06-01), Nakagawara
patent: 5332937 (1994-07-01), Castello et al.
patent: 5432477 (1995-07-01), Nishiyama et al.
patent: 5596289 (1997-01-01), Liu
patent: 5684429 (1997-11-01), Sanwo et al.
Alini Roberto
Cosentino Gaetano
Pisati Valerio
Vai Gianfranco
Callahan Timothy P.
Carlson David V.
Luu An T.
STMicroelectronics S.r.l.
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