Effects of Amplitude, Phase, and Frequency ImDerfections on the Performance of a Direct Conversion Receiver (DCR) for

Results from a practical study of a direct conver- sion receiver (DCR) and its subsections, namely, power splitter, branch coupler hybrid, coupled lines band-pass filter, low-pass fil- ter, balanced mixer, and oscillator, are presented. The receiver is designed for the 2-GHz frequency band, with particular reference to personal communications terminals for the digital european cordless telecommunications (DECT) standard. The DCR overall performance, based on measured figures of individual subcircuits, is analyzed with the aid of the "Ihof-Omnisys" simulator. m- ical value for the signal-to-noise ratio 12 dBm for lo-' bit-error rate. The receiver can tolerate amplitude and phase mismatches of 3% and 5O, respectively, as well as 13-k& local dator drift. The dynamic range is 80 dJ3. The performance of the DCR fits well with the DECT specification.