A current-reuse MICS band CMOS RF transmitter for implantable cardioverter telemetry system

Abstract

A MICS band CMOS RF transmitter is presented for implantable cardioverter telemtry system. Current-reuse and gain boosting techniques are employed for reducing the current consumption as well as improving the output power. Fabricated in 0.18 µm CMOS, the transmitter dissipates 9.3 mW from a 1.8-V supply. Measurement shows that the gain boosting capability increases the output power by 1.3-5.5 dB, while the image and LO suppression is unaffected. The proposed approach can be effective for a low-power RF transmitter design in implantable telemetry devices.

A 3.8 MHz CMOS Wien-bridge oscillator with differential capacitive automatic amplitude control

“…Many circuit design techniques for minimizing power consumption can be found in literature, for instance, in receiver [2], transmitter [3], and VCO [4]. However, ULP radios will not be possible unless a stable and precision clock generator can be also integrated on a chip.…”