A 69-Mbps dual tuning 8PSK/QPSK transmitter using injection locking and RF phase modulation

This work presents a high data rate, energy efficient quadrature phase shift keying (QPSK) transmitter suitable for biomedical applications. The transmitter includes a dual tuning mechanism to enable flexible phase/frequency control by direct modulation of a class-E oscillator while maintaining synchronization by using injection locking. The circuit is implemented in TSMC 65-nm CMOS technology with a core size 1 mm2. Using a 1.3-V supply, a transmit power of 14.1 dBm. For an injection frequency of 2.2 GHz, the circuit achieves a high throughput data rate equal to 69 Mbps.