Title :
A 2-GHz subharmonic sampler for signal downconversion
Author :
Pärssinen, Aarno ; Magoon, Rahul ; Long, Stephen I. ; Porra, Veikko
Author_Institution :
Inst. of Radio Commun., Helsinki Univ. of Technol., Espoo, Finland
fDate :
12/1/1997 12:00:00 AM
Abstract :
Subharmonic sampling is a discrete-time solution to the signal downconversion problem. It can be used either to replace a traditional continuous-time mixer in a superheterodyne receiver or can be combined with other discrete-time analog signal processing blocks in novel receiver architectures. We present a 2-GHz bandwidth integrated mixer based on subharmonic sampling operating at sampling frequencies from 40 MHz to 1.5 GHz. The conversion efficiency is optimized by appropriate choice of the clock duty cycle. The sampler uses a two-diode topology with a 3-V supply. The downconversion loss for the passive sampler is 1 dB and the total system gain 3 dB, The mixer achieves IIP3 of +16-dBm and -1-dB compression +7 dBm for a single-tone input. The circuit was implemented with a 0.6-μm GaAs metal-semiconductor field effect transistor (MESFET) process
Keywords :
III-V semiconductors; MESFET integrated circuits; UHF frequency convertors; UHF integrated circuits; UHF mixers; analogue processing circuits; discrete time systems; gallium arsenide; mobile communication; sampled data circuits; 0.6 micron; 1 dB; 2 GHz; 3 V; 3 dB; 40 MHz to 1.5 GHz; GaAs; MESFET process; analog signal processing blocks; clock duty cycle; conversion efficiency; discrete-time solution; downconversion loss; integrated mixer; signal downconversion; single-tone input; subharmonic sampler; total system gain; two-diode topology; Bandwidth; Circuit topology; Clocks; FETs; Frequency; Gain; Gallium arsenide; Mixers; Signal processing; Signal sampling;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
