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A receiver includes an input section, a plurality of RF sections, an output circuit, and a controller. The input section receives and amplifies a radio frequency (RF) input signal to provide an amplified RF signal, and has a gain input. The plurality of RF sections each have an input for receiving t

A receiver includes an input section, a plurality of RF sections, an output circuit, and a controller. The input section receives and amplifies a radio frequency (RF) input signal to provide an amplified RF signal, and has a gain input. The plurality of RF sections each have an input for receiving the amplified RF signal, and an output for providing an intermediate frequency signal. The output circuit provides an intermediate frequency output signal in response to an output of at least one of the plurality of RF sections. The controller has an output coupled to the gain input of the input section.

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1. A receiver comprising: an input section for receiving and amplifying a radio frequency (RF) input signal to provide an amplified RF signal;a plurality of RF sections each having an input coupled for receiving said amplified RF signal, and an output for providing an intermediate frequency signal,

1. A receiver comprising: an input section for receiving and amplifying a radio frequency (RF) input signal to provide an amplified RF signal;a plurality of RF sections each having an input coupled for receiving said amplified RF signal, and an output for providing an intermediate frequency signal, each of said plurality of RF sections comprising:a programmable gain element for receiving and amplifying a corresponding amplified RF signal; anda mixer for mixing said corresponding amplified RF signal with in-phase and quadrature local oscillator signals to provide an in-phase IF signal and a quadrature IF signal, andan output circuit for providing an intermediate frequency output signal in response to an output of at least one of said plurality of RF sections. 2. The receiver of claim 1, further comprising a controller having outputs coupled to said programmable gain element of each of said plurality of RF sections, forming a corresponding plurality of automatic gain control loops. 3. The receiver of claim 2, wherein: each of said plurality of RF sections further comprises a power detector for measuring a signal power in response to an output of a corresponding programmable gain element; andsaid controller further uses said signal power to implement a corresponding automatic gain control loop. 4. The receiver of claim 2, wherein said input section comprises: a plurality of low noise amplifiers each having an input for receiving said RF input signal, and an output; anda switch matrix having an input coupled to said output of each of said plurality of low noise amplifiers, and outputs for providing said amplified RF signal. 5. The receiver of claim 4, wherein: said switch matrix further includes a control input; andwherein said controller provides said output thereof to said control input of said switch matrix. 6. The receiver of claim 5, wherein: said switch matrix is responsive to said control input to switch outputs of said plurality of low noise amplifiers between said outputs of said switch matrix and a dump terminal. 7. The receiver of claim 6, wherein: the receiver further comprises at least one power detector having an output; andsaid controller further has an input coupled to said output of said at least one power detector, wherein said controller is responsive to said output of said at least one power detector to provide said output to a gain input of said input section. 8. The receiver of claim 1, wherein each of said plurality of RF sections further comprises a local oscillator. 9. The receiver of claim 1, wherein said input section comprises at least one low noise amplifier. 10. The receiver of claim 9, wherein said input section further comprises a switch matrix having an input coupled to an output of each of said at least one low noise amplifier, and outputs coupled to respective ones of said plurality of RF sections. 11. The receiver of claim 1, wherein at least one of said plurality of RF sections comprises a tunable lowpass filter having an output coupled to an input of said mixer. 12. A receiver comprising: an input section for receiving and amplifying a radio frequency (RF) input signal to provide an amplified RF signal, and having a gain input for receiving a first gain;a plurality of RF sections each having an input for receiving said amplified RF signal, a gain input for receiving a second gain, a first output for providing an intermediate frequency signal, and a second output for providing a detected power signal;an output circuit for providing an intermediate frequency output signal in response to an output of at least one of said plurality of RF sections; anda controller for providing said first and second gains in response to said detected power in a selected one of said plurality of RF sections. 13. The receiver of claim 12, wherein said input section comprises: a plurality of low noise amplifiers each having an input for receiving an RF input signal, and an output; anda switch matrix having an input coupled to said output of each of said plurality of low noise amplifiers, and outputs for providing a corresponding RF signal to each of said plurality of RF sections. 14. The receiver of claim 13, wherein: said switch matrix further includes a control input for receiving said first gain; andwherein said controller provides said output thereof to said control input of said switch matrix. 15. The receiver of claim 14, wherein: said switch matrix is responsive to said control input to switch outputs of said plurality of low noise amplifiers between said outputs of said switch matrix and a dump terminal. 16. The receiver of claim 12, wherein: each of said plurality of RF sections further comprises at least one power detector having an output; andsaid controller further has an input coupled to said output of said at least one power detector, wherein said controller is responsive to said output of said at least one power detector to provide said output to said gain input of said input section. 17. A method comprising: receiving and amplifying a radio frequency (RF) input signal according to a first gain to provide an amplified RF signal;processing said amplified RF signal in a selected one of a plurality of RF sections according to a second gain to provide an intermediate frequency (IF) signal;detecting a power in said at least one of said plurality of RF sections; andadjusting said first and second gains in response to said power. 18. The method of claim 17 wherein: said processing comprises filtering a signal in said selected one of said plurality of RF sections according to a selected channel to provide a filtered signal; andsaid detecting said power comprises detecting said power in said filtered signal. 19. The method of claim 18 wherein said processing further comprises: processing said amplified RF signal in one of a plurality of RF sections selected in response to said selected channel. 20. The method of claim 17 wherein said receiving and amplifying comprises: providing said RF input signal to inputs of a plurality of low noise amplifiers; andswitching outputs of selected ones of said plurality of low noise amplifiers to said selected one of said plurality of RF sections based on said first gain.