Patent ID: 6253068
Filing Date: 2001-06-26
Classification: H04B

Abstract:
A transmitter comprising:an oscillator forming part of a phase-lock loop (PLL);a modulator, said oscillator and said modulator being formed on a single monolithic chip;an antenna, said antenna forming part of a resonant network of the oscillator, a resonance point of said resonant network being automatically tuned to a transmit frequency of said transmitter; anda track and hold circuit coupled between the loop filter and the oscillator, the track and hold circuit being formed on the single monolithic chip, the track and hold circuit holding the phase-lock-loop state prior to disabling the oscillator in the event of a `space` transmission,wherein the phase-lock-loop further includes a loop filter coupled between the phase detector and the oscillator, the loop filter being formed on the single monolithic chip.