Abstract
A design procedure is proposed for triple-push ring oscillators, and an oscillator employing a coupled line-matching network is developed following the procedure. This stepwise procedure, which uses power-dependent Z-parameters of transistors, is applied to the design of each amplifier stage constituting a ring oscillator based on its steady-state oscillation condition. It is verified with both L-section and T-section topologies assumed for the load of the amplifier stages of a given triple-push ring oscillator, and the differences between the two topologies are compared. Based on the procedure, a 270 GHz triple-push ring oscillator that employs coupled lines for matching networks has been developed in a 65-nm CMOS process. The circuit benefits from the advantages of coupled lines such as compact area and simplified layout. The fabricated oscillator exhibits a measured oscillation frequency of around 270 GHz and output power of -10.9 dBm, with phase noise of -96 dBc/Hz at 10 MHz offset.
Original language | English |
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Pages (from-to) | 449-462 |
Number of pages | 14 |
Journal | IEEE Transactions on Terahertz Science and Technology |
Volume | 9 |
Issue number | 5 |
DOIs | |
State | Published - 1 Jan 2019 |
Keywords
- CMOS
- CMOS technology
- coupled lines
- Harmonic analysis
- harmonic generation
- Impedance
- Impedance matching
- millimeter-wave
- oscillators
- Ring oscillators
- ring oscillators
- Steady-state
- sub-millimeter wave
- terahertz
- triple-push