Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1981-09-22
1984-07-03
Miller, Stanley D.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
332 31R, 332 37R, H03C 102, H03K 700
Patent
active
044582161
ABSTRACT:
A switched-capacitor modulator for quadrature modulation is disclosed. The modulator of the present invention provides a means for simultaneous modulation of two carrier signals in quadrature by two input signals in such a way that the gains of the two modulations are exactly the same. In accordance with the invention a switched-capacitor modulator is provided having a plurality of input signal sources for quadrature amplitude modulation. The invention provides for a single common switched-capacitor network with multiple switches or multiple switched-capacitor networks for each incoming modulating signal. A switched-capacitor network utilized to form and modulate a carrier signal for shaping the carrier to reduce sidebands of the third and fifth harmonics in the modulated signal is also disclosed.
REFERENCES:
patent: 3937882 (1976-02-01), Bingham
patent: 4295105 (1981-10-01), Bingham
"An Overview of Switched-Capacitor Networks", Martin, Asilomar Conference on Circuits, Systems & Computers, Nov. 1980.
"Generation of Synchronous Data Transmission Signals by Digital Echo Modulation," M. F. Choquet and H. J. Nussbaumer, IBM J. on Res. Dev., Sep. 1971.
"Improved Circuits for the Realization of Switched Capacitor Filters", Ken Martin, Proceedings of 1979 ISCAS.
"The Digital Echo Modulation", Croisier and Pierret, IEEE Transactions on Communication Technology, vol. Com-18, No. 4, Aug. 1970.
Hosticka, B. J. et al., "MOS Sampled Data Recursive Filters Using Switched Capacitor Integrators", IEEE Journal of Solid State Circuits, vol. SC12, No. 6, pp. 600-608, Dec. 1977.
Martin, K. et al., "Strays Insensitive Switched-Capacitor Filters Based on Bilinear Z Transform", Electronics Letters, vol. 15, No. 3, pp. 365-366, Jun. 1979.
Richardson, A. J., "Balanced Modulator Using CMOS Switches", Electronic Engineering, Dec. 1978, p. 17.
Miller Stanley D.
Paxman W. R.
Racal-Vadic Inc.
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