Voltage Controlled Oscillator with Optimized Broadband Frequency Coverage Uniformity

Abstract

The invention provides a voltage-controlled oscillator for optimizing broadband frequency coverage evenness. The voltage-controlled oscillator comprises negative resistance amplifiers, a difference inductor and a frequency adjustor. The different inductor is connected with the frequency adjustor in parallel. The voltage-controlled oscillator is characterized in that a first output end of the first negative resistance amplifier and a first output end of the second negative resistance amplifier are connected with one end of the different inductor at the same time, and a second output end of the first negative resistance amplifier and a second output end of the second negative resistance amplifier are connected with the other end of the difference inductor at the same time. Meanwhile, the voltage-controlled oscillator is further provided with multiple capacitance switch modules. The first capacitance switch module is composed of a first capacitance switch unit, the second capacitance switch module is composed of two capacitance switch units in parallel, and the third capacitance switch module is composed of four capacitance switch units in parallel. On the analogy, the n capacitance switch module is composed of 2n-1 capacitance switch units in parallel, wherein n is larger than or equal to two. The evenness problem of the oscillation frequency difference value between VCO segments is solved.

Description

technical field [0001] The invention relates to a voltage-controlled oscillator, in particular to an LC-type voltage-controlled oscillator with optimized broadband frequency coverage uniformity. [0002] technical background [0003] With the development of modern communication systems, various new communication standards have been proposed. A single chip needs to integrate more communication protocols, and the frequency bands occupied by different communication protocols are also different, which means providing frequency synthesis modules for local oscillators for RF chips. The PLL needs a wider frequency coverage. With the further widening of the frequency coverage, the requirement for frequency coverage uniformity is getting higher and higher. [0004] The classic analog phase-locked loop module includes: phase-frequency detector (PFD), loop filter (LPF), frequency divider (DIV), voltage-controlled oscillator (VCO). In order to obtain a wide frequency coverage in the pha...

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Problems solved by technology

[0006] Although the size of the switch tube is also in accordance with 2 n to multiply, but due to the layout of the layout and the parasitic capacitance of the switch tube, it is difficult to achieve the total equivalent capacitance of the switch tube and the series capacitor according to 2 n The traditional method is difficult to ensure the uniformity of broadband VCO frequency coverage

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