Patent ID: 6614837
Filing Date: 2003-09-02
Classification: H04B

Abstract:
A transmitting device for receiving a modulated signal having a modulation bandwidth and an intermediate center frequency and generating a modulated transmit band signal at a carrier frequency, the transmitting device comprising:a first filter having a first filter input coupled to receive the modulated signal and pass frequencies within the modulation bandwidth, and a first filter output to provide a filtered modulated signal; a low noise frequency source for generating a main synthesizer frequency, the low noise frequency source having noise characteristics greater than a noise rejection requirement for a receive band of the transmitting device; and a mixer having a first mixer input coupled to the first filter output to receive the filtered modulated signal, a second mixer input coupled to the low noise frequency source to receive the main synthesizer frequency, and a mixer output to provide the modulated transmit band signal, the modulated transmit band signal representing a mixing of the filtered modulated signal with the main synthesizer frequency.