Low-power OOK transceiver design for spin torque nano oscillator

Abstract

As technologies develop, consumer wants more compact-sized handheld devices. With CMOS technology advancing at a fast-growing rate, the size of digital circuit is shrinking and more digital process circuit are integrated in a single chip. However the size of the RF block is not shrinking as digital circuit. Conventional LC-tank based oscillator is widely used in today’s wireless transceiver for their superior phase noise performance. And the size of the passive device such as inductor is difficult to reduce as CMOS technology advances because inductance or capacitance are strongly depend on the physical dimension. Spin-torque nano-oscillator is the promising device for the future RF communication. It has merit of nano size. The size of STNO is 50 times smaller than the conventional LC-tank based oscillator. Another merit of STNO is wide frequency tuning range. This thesis presents a low-power OOK transceiver for spin-torque nano-oscillator. It operates with low power consumption enhancing the energy efficiency. Also this OOK transceiver has a very small footprint of the chip. The proposed OOK receiver consists of inductorless wideband balun-LNA, a modified Cherry-Hooper amplifier, a negative impedance converter, an envelope detector, a baseband stage. The current reuse with a capacitive cross coupling technique is applied to inductorless wideband balun-LNA. A modified Cherry-Hooper amplifier is used to make up for lacking gain for demodulation. The envelope detector demodulate RF OOK signal to baseband data signal. The baseband stage is used for chip measurement purpose. The baseband stage consists of baseband amplifiers and a comparator. The proposed OOK transmitter consists of STNO with bias-T network, inductorless wideband balun-LNA, three cascaded modified Cherry-Hooper amplifier and a buffer. The proposed receiver consumes 8.5 mW including baseband stage. It can process data have data rate of 200 Mbps. Therefore, is shows energy efficiency of 42.5 pJ/Bit...