In this work we investigate the transmit and receive performance of a probe employing such switching, using a simple loop coil tuned to 45 and 169 MHz for the detection of 23Na and 1H, respectively, at 4T. PIN diode switched-capacitor networks work well under forward bias, but perform poorly in reverse bias. Specifically, a high reverse bias voltage is required to allow operation over a realistic range of RF transmit voltages. This makes such switched-capacitor networks unsuitable for use in transmit probes. However, they can be used in receive-only probes, because the voltages present on the loop are much smaller.
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