Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1986-02-10
1988-12-13
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328127, 307521, H03K 500, H03B 100
Patent
active
047913797
ABSTRACT:
A continuous time electrical filter fabricated as an integrated circuit includes capacitors (CO,CN) and resistors (R1,R2). Since capacitors and resistors are difficult to integrate with accurately defined values a trimming circuit is provided which operates switches (S1-SN) to select appropriate ones of the capacitors (CN) to accurately define the cut-off frequency of the filter. The trimming circuit comprises a capacitor (TC2) which is charged through a resistor TR1 during a first period and which is discharged in incremental steps by a capacitor (TC1). The number of incremental steps is counted by a counter (11) and transferred to a register (13). The outputs (S1-SN) of the register control the switches (S1-SN). Instead of adjusting the value of the capacitors in the filter, the values of the resistors may be adjusted. If this is done a convenient procedure is to short out selected portions of the resistors. More than one capacitor or resistor may be adjusted using a single counter and register.
REFERENCES:
patent: 4385242 (1983-05-01), Wagener
patent: 4392068 (1983-07-01), Welles, II
patent: 4511992 (1985-04-01), Dureigne et al.
patent: 4691171 (1987-09-01), Van Roermund et al.
Callahan Timothy P.
Franzblau Bernard
Miller Stanley D.
U.S. Philips Corporation
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