Quarter duty cycle pulse generator for interleaved switching...

Details Quarter duty cycle pulse generator for interleaved switching... Quarter duty cycle pulse generator for interleaved switching...

2008-03-27

2011-12-13

Lam, Kenneth (Department: 2611)

Pulse or digital communications

Transmitters

Angle modulation

C375S299000, C375S295000, C375S298000, C375S296000, C375S355000, C455S118000, C455S318000, C455S313000, C329S300000, C329S304000

Reexamination Certificate

active

08077803

ABSTRACT:
An integrated transmit circuit includes a voltage controlled oscillator (702) for generating an input frequency signal (e.g., VCO) that is provided to a divide by two quadrature generator circuit (706) which generates therefrom in-phase and quadrature clocking signals (I, IB, Q, QB) that are applied to control a plurality of transmission gates (711-718) configured in a matched switching topology (710) so as to selectively pass pulses from the input frequency signal, thereby generating interleaved LO pulses (Ø1, Ø1B, . . . Ø4, Ø4B). By applying the interleaved LO pulses to control the transmission gates (26, 28, 30, 32, 34, 36, 38, and40) in the upmixer (720), the +I, −I, +Q, −Q input signals are interleaved over a plurality of phases of a carrier period to produce differential outputs (42, 44).

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