Telecommunications – Transmitter – Angle modulation
Patent
1994-05-10
1996-07-09
Urban, Edward F.
Telecommunications
Transmitter
Angle modulation
455 121, 455115, 330207A, 330251, 375297, H04B 104, H03F 2100
Patent
active
055354386
ABSTRACT:
A low earth orbiting satellite communication terminal includes a data signal generator, a modulator, and a class E switching amplifier. The modulator converts a data signal from the data signal generator into a phase modulated signal which is then amplified by the class E switching amplifier for transmission to a low earth orbiting satellite. In a preferred embodiment, the modulator converts the data signal into a symmetric differential phase shift keyed data signal. The class E switching amplifier amplifies the phase modulated signal at frequencies between about 148 and 150 MHz. The class E switching amplifier includes a switching transistor, an input matching network, a class E load network, and an output matching network. The class E load network is electrically connected to the switching transistor and loads the transistor for phase linear class E operation over a predetermined bandwidth. The class E switching amplifier may include a transistor which is designed to operate at a first predetermined frequency and at a first predetermined voltage, but which is preferably operated below these predetermined levels.
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Nguyen Lee
Panasonic Technologies Inc.
Urban Edward F.
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