An injection-enhanced low-power injection-locked frequency tripler with wide locking range

Abstract

The invention belongs to the field of a radio frequency integrated circuit, and specifically relates to an injection enhanced low-power wide-locking-scope injection locking tripler. The circuit of the tripler is composed of a harmonic wave generator, a bypass current source and an injection locking oscillator. The harmonic wave generator is composed of a pair of NMOS tubes, by use of the nonlinearity characteristic of MOS tubes, fundamental frequency signals with omega as its input frequency are input, triple harmonic wave signals 3 omega are generated and are injected to the oscillator; the bypass current source is composed of a pair of PMOS tubes, the grid end of the bypass current source is biased on proper DC voltages, and proper current dividing is performed on the oscillator by taking the bypass current source as a DC source, such that the harmonic wave injection efficiency is improved; and the injection locking oscillator is composed of a pair of intersected coupling transistors, an inductor, capacitors and a digital control capacitor array, and the center frequency of the injection locking oscillator is near the 3 omega. The tripler provided by the invention improves the harmonic wave injection efficiency, and under the condition that power consumption is basically not increased, compared to a conventional injection locking tripler, greatly expands the locking scope.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to an injection-enhanced low-power-consumption and wide-locking-range injection-locked frequency tripler (Injection Locked Frequency Tripler, ILFT) applied to a radio frequency synthesizer. Background technique [0002] In millimeter-wave communication, there are two ways to generate local oscillator signals: the first method uses a phase-locked loop directly operating at the required frequency to provide local oscillator signals; the second method uses a low-frequency phase-locked loop followed by a multiplier Frequency converter to provide local oscillator signal. The most important part of the phase-locked loop is the design of the voltage-controlled oscillator (VCO). If the first method of generating local oscillator signals is adopted, it is difficult to design a A high-performance voltage-controlled oscillator (VCO) that meets the requirements of the c...

AI Technical Summary

Problems solved by technology

Conventional injection-locked triplers such as figure 1 As shown, the fundamental frequency signal is input into the injection tubes NMOS tubes (M1 and M2), and the third harmonic is generated by using the nonlinear characteristics of the NMOS tubes (M1 and M2). The nonlinear characteristics of the MOS tube determine the injection of the third harmonic generated in this way. ratio is small, so it is difficult to achieve a wide lock range

In order to improve the injection efficiency, the size of the injection tube needs to be increased, which also means that more power consumption is required

Therefore, it is difficult for the injection-locked frequency tripler with the traditional structure to meet the wide locking range and low power consumption at the same time.

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