Method and apparatus for trimming a signal

Details Method and apparatus for trimming a signal Method and apparatus for trimming a signal

1997-12-10

2000-01-04

Le, Dinh

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327553, 327103, 327362, H03K 500, H03K 1768

Patent

active

060114185

ABSTRACT:
A hard disk drive system (10) has a read/write head (12) coupled to a read channel circuit (23) in an integrated circuit (13). The read channel circuit includes a bipolar transconductance-C filter (26) having at least one capacitor (27) with a capacitance value that may vary from an intended value. A temperature compensating voltage (VPTAT) is converted to a first current, a programming circuit (51) produces a second current (IPROG) as a function of the first current and a digital compensating input (54), and the second current is converted to a voltage (61) and used to control characteristics of the filter circuit. A trimming circuit (46) shunts away from the programming circuit a portion of the current generated by the voltage-to-current converter circuit, which portion is defined by a digital trim input (48).

REFERENCES:
patent: 5200654 (1993-04-01), Archer

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