Low power consumption injection locked frequency tripler

An injection locking and frequency tripler technology, applied in power oscillators, electrical components, etc., can solve the problem of circuit limitation and wide application, and achieve the effect of increasing the output frequency locking range, low DC power consumption, and low power consumption

Inactive Publication Date: 2013-12-25
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the case of high frequency, the large power consumption and circuit complexity of tradi

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  • Low power consumption injection locked frequency tripler
  • Low power consumption injection locked frequency tripler
  • Low power consumption injection locked frequency tripler

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[0019] The following description is given in conjunction with the accompanying drawings:

[0020] like figure 1 As shown, the traditional injection-locked tripler circuit consists of L1 and C1 to form a resonant cavity, and cross-coupling tubes M3 and M4 provide negative resistance to maintain oscillation. The signal is input to the gates of the injection tubes M1 and M2 through the single-turn double of the off-chip balun, and the third harmonic generated by the transistors M1 and M2 is injected into the resonant cavity through the sources of M3 and M4. At the same time, transistors M1 and M2 also provide DC bias for the circuit, so that the entire circuit can start up normally. figure 2 Efficiency versus conduction angle for generating third harmonic current for transistors M1 and M2, it is clear that in order to obtain a larger third harmonic current for a larger locking range, transistors M1 and M2 should be biased in the weak inversion region ( Conduction angle 50~100...

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Abstract

The invention belongs to the technical field of integrated circuits of radiofrequency frequency synthesizers, and particularly relates to a low power consumption injection locked frequency tripler. A circuit comprises a harmonic wave generator and an injection locked oscillator. The harmonic wave generator is formed by a pair of NMOS tubes and is arranged in a weak inversion area in a bias mode, and triple frequency harmonic signals 3f0 with the maximum efficiency are generated by inputting fundamental frequency signals f0. The injection locked oscillator is composed of a pair of cross-coupled transistors, an inductor, a variable capacitor, a digital control capacitor array and an adjustable current source, and the working frequency of the injection locked oscillator is near the 3f0. In a free oscillation mode, the grid electrodes of the NMOS tubes have no input signals, bias currents of the injection locked oscillator are supplied by the adjustable current source, and self-oscillation frequency is output; in an injection locked mode, the grid electrodes of the NMOS tubes have fundamental frequency signals with frequency near the f0, an injection locked frequency tripler circuit is made to be locked at the frequency 3 f0, and the power consumption of the direct currents at the moment is extremely low. The power source voltages of the circuit are 0.8V, and the power consumption of the direct currents is only 0.16mW.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a low-power injection locked frequency tripler (Injection locked frequency tripler) applied to a radio frequency synthesizer. Background technique [0002] In today's society, information technology is developing rapidly. With the development of wireless communication technology, the demand for high-speed communication is increasing. However, unlike the low-frequency case, designing a high-frequency receiver presents many challenges, one of which is the design of the frequency synthesizer and its important component, the voltage-controlled oscillator (VCO). Usually a mmWave VCO should be at or close to the similar performance of a low frequency VCO, including lower phase noise, low power consumption, moderate output power, proper regulation range and a relatively low VCO gain (for tuning Capacitance sensitive), in order to make it less restrictive to the...

Claims

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Application Information

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IPC IPC(8): H03B19/00
Inventor 李巍周自波
Owner FUDAN UNIV
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