Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1984-06-13
1986-10-07
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307529, 364703, 375 24, H03B 1900, H03C 100
Patent
active
046161856
ABSTRACT:
Multiplying circuit for multiplying a first signal x(t) by a periodic second signal y(t) and being particularly suitable for use as an amplitude demodulator in a stereo decoder or in a phase-locked loop. It comprises N signal channels 26(k) wherein k=0, 1, . . . n-1, each receiving the first signal x(t) and each producing a channel signal. Each signal channel is formed by, arranged in cascade, a switched-capacitor circuit 28(k;1), 28(k;2), 29(k), the circuit included in the signal channel being controlled by a train of control pulses g(k,i) which each have a finite duration and occur with a repetition period T.sub.o and at instants t.sub.o +k(T.sub.o /N)+iT.sub.o where i= . . . -2, -1, 0, 1, 2, 3, . . . , means 29(k), 31, 30 for multiplying the amplitude of the signal x(t) by a constant weighting factor W(k) which is equal to y(t.sub.o +k(T.sub.o /N), pulse-reshaping means 29(k), 30, 31 for converting a pulse applied thereto into a pulse having a predetermined duration. The channel signals thus obtained are added together in an adder device 30, 31 to form a sum signal. This sum signal is sampled in a sampling arrangement 34(1), 34(2), 35 at instants comprised within the interval between the end of a control pulse g(k,i) and the beginning of the subsequent control pulse g(k+1,i).
REFERENCES:
patent: 3611143 (1971-10-01), van Gerwen Enmasingel
patent: 3869670 (1975-03-01), Grutzmann et al.
patent: 4006353 (1977-02-01), Pierce
patent: 4517655 (1985-05-01), Claasen et al.
Allstot et al., "A Switched Capacitor N-Path Filter", IEEE Sym. on Circuits and Systems, May 1980, pp. 313-316.
Briody Thomas A.
Callahan Timothy P.
Eason Leroy
Miller Stanley D.
Streeter William J.
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