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A 7.2mW 15Mbps ASK CMOS transmitter for ingestible capsule endoscopy

This paper presents an amplitude shift keying (ASK) transmitter for high-quality imaging in ingestible capsule endoscopy application. A carrier frequency of 900MHz is generated by a complementary LC voltage-controlled oscillator, and directly modulated with a digital baseband ASK signal by switching on and off a driver amplifier (DA). The modulated signal is amplified by the DA and transmitted through an inductive coupling. The transmitter has been fabricated in 0.18µm CMOS process. A peak output power of 1dBm can be transmitted and power consumption is 7.2mW at a data rate of 15Mbps.