Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1988-05-05
1990-07-03
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307261, 328 56, 328 59, 332149, 333150, H03K 5159, H03C 300
Patent
active
049393871
ABSTRACT:
An amplitude modulation apparatus for achieving an extremely deep extinction ratio (in excess of -90 dBc) at nanosecond rise times required by an SAW device comprises the cascaded combination of a controlled switching device (GaAsFET), capable of providing a medium degree (40 dB) of attenuation at nanosecond switching rates, and a double balanced mixer, both multiplier input ports of which are coupled to receive split outputs from the GaAsFET switch. Because of the nonlinearity of the transfer function of the mixer when driven by the same RF carrier input at both multiplier ports, the output of the mixer is in excess of -90 dBc. In an SAW-based signal processing system, the output of the mixer is coupled to RF drive input of the SAW device. With the throughput functionality of the GaAsFET switch being precisely controlled to supply an integral number of half RF carrier frequency cycles to the double balanced mixer, the resultant waveform that is applied to the SAW device drive input from the mixer contains no energy at the RF carrier that could otherwise introduce unwanted Fresnel distortion.
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Bentley Pat O.
Popek Marc H.
Callahan Timothy P.
Harris Corporation
Miller Stanley D.
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