Apparatus providing a substantially equal transconductance ratio

Details Apparatus providing a substantially equal transconductance ratio Apparatus providing a substantially equal transconductance ratio

1998-02-26

1999-10-12

Young, Brian

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341144, 341143, H03M 300

Patent

active

059660872

ABSTRACT:
A current source (200) comprises an input bias unit (291), a transconductance unit (295), an output bias unit (292), a combiner unit (296) and a voltage source 130'. In the transconductance unit (295), a first current mirror (215) provides currents I.sub.A and I.sub.B which are distributed to cross-coupled first and second transistors arrangements (TA 3 and TA 4). The first arrangements (TA 3) receives a control signal (V.sub.GS12) which is derived from a master signal (205') at a master terminal (205). The second arrangement (TA 4) is controlled from the first arrangement (TA 3). The transconductance ratio between the arrangements (TA 3 and TA 4) is regulated through a feedback in a second current mirror (235). A transconductance drift is substantially prevented. Output currents which are related to this stabilized transconductance ratio are provided at output terminals (203, 204). A first output current (I.sub.out1) is derived from the second arrangement (TA 3) and a second output current (I.sub.out2) is derived by from the master signal and from the second arrangement (TA 3).

REFERENCES:
patent: 5189321 (1993-02-01), Seevinck
patent: 5223743 (1993-06-01), Nakagawara
patent: 5311088 (1994-05-01), Nelson
patent: 5408235 (1995-04-01), Doyle et al.
patent: 5781137 (1998-07-01), Knudsen
patent: 5793811 (1998-08-01), Yu
Horowitz, P., Hill, W.: "The Art of Electronics", Second Edition, Cambridge University Press, 1990, ISBN 0-521-37095-7, chapter 3.07 "FET amplifiers" on pp. 129-133.

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