Abstract
This paper presents the design detail of intermediate frequency (IF) circuit used in Ka-band superheterodyne frequency modulated continuous wave (FMCW) reflectometer. A complete circuit of superheterodyne consists of two or more down conversions in which the first stage uses the high radio frequency (RF) as a local oscillator (LO) frequency; further in the next stage a low-frequency reference signal is used as a LO frequency. In this work, a 200 MHz low frequency stage of receiver is designed for plasma density measurement. The circuit includes a crystal oscillator, frequency doubler, low noise amplifier, band pass filter and IQ demodulator stage. The circuit design details are presented and the experimental results of the prototyping system are given.
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