Patent ID: 7962949

Claim:
Apparatus, comprising: a surface acoustic wave filter; and an integrated circuit embodied on a single monolithic substrate in which each of the following circuit components are fabricated on that single monolithic substrate: an input adapted to receive an analog signal including a plurality of channels; an upconversion device to upconvert the received analog signal; a first port for off substrate connection to an input of the surface acoustic wave filter and coupled to receive the upconverted analog signal for application to the surface acoustic wave filter; a second port for off substrate connection to an output of the surface acoustic wave filter to receive a filtered upconverted signal from the surface acoustic wave filter; and a downconversion device coupled to the second port to downconvert the filtered upconverted signal to a baseband signal centered at zero frequency; a baseband filtering circuit that filters the baseband signal to generate a filtered analog baseband signal, the baseband filtering circuit having an upper cutoff frequency greater than a frequency half-width of one channel; an analog-to-digital converter circuit that converts the filtered analog baseband signal to a digital baseband signal, the analog-to-digital converter circuit having a sampling frequency which is at least ten times the upper cutoff frequency of the baseband filtering circuit; and a digital baseband decimating filter that filters the digital baseband signal to generate a filtered digital baseband signal; wherein the single monolithic substrate further includes an oxide layer on a rear surface of the substrate, the apparatus further comprising: a metal plate glued to the oxide layer on the rear surface of the substrate to form a first plate of a capacitor, wherein a second plate of the capacitor is formed by the single monolithic substrate.