Abstract
A design for a high-output-power, high-frequency CMOS oscillator is presented in this paper. The proposed oscillator can increase the output power by coupling the signal at the source of the core transistor to the drain of the buffer transistor. In addition, the source-to-drain coupling generates an optimum negative transconductance at the desired operating frequency. A capacitive load reduction circuit is also applied to increase the fundamental oscillation frequency. Using these techniques, the fundamental and push-push oscillators were implemented using 65 nm CMOS technology. The measurement results of the fundamental and push-push oscillators showed 2.7 and -25 dBm of peak differential output power at 194 and 394 GHz, respectively. In the 200 GHz frequency band, the proposed fundamental oscillator shows the highest output power among recently reported state-of-the-art CMOS oscillators.
Highlights
Recently, circuits operating in the Terahertz (THz) frequency band, which is defined as 300 GHz to 3 THz [1]–[3], is an attractive research topic
With THz frequency signal sources, it is hard to generate high power when implemented optically or electrically because the frequency range is too high for electronics
ANALYSIS OF PROPOSED FUNDAMENTAL OSCILLATOR An XCO with a high LS value could potentially improve the oscillation frequency by reducing the effective capacitance; it cannot satisfy the start-up condition to sustain the oscillation because of no negative transconductance generated at the high frequency
Summary
Circuits operating in the Terahertz (THz) frequency band, which is defined as 300 GHz to 3 THz [1]–[3], is an attractive research topic. To obtain higher fundamental oscillation frequency, the proposed topology includes a capacitive load reduction circuit (CLRC) Using these techniques, a 194 GHz fundamental oscillator with the output power of 2.67 dBm was designed and implemented. ANALYSIS OF PROPOSED FUNDAMENTAL OSCILLATOR An XCO with a high LS value could potentially improve the oscillation frequency by reducing the effective capacitance; it cannot satisfy the start-up condition to sustain the oscillation because of no negative transconductance generated at the high frequency. A source-to-drain coupling (STDC) technique is proposed to solve this problem because it helps the XCO with LS generate the negative transconductance at high frequency.
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