Integrated circuit structure of differential-mode variodenser

Abstract

An integrated circuit structure of a differential varactor, comprising: a p-type substrate; an n-type well region arranged on the top surface of the p-type substrate; at least three n-type ion implantation regions respectively arranged on the n-type well region The top surface of the well region; a metal connection connecting the at least three n-type ion implantation regions; a bias control point, which is coupled to the n-type ion implantation region; and, a first gate pole and a second grid are connected together. The integrated circuit of the differential varactor is designed in a combined way, and the parasitic effect can be considered in the production process, thereby reducing the inaccuracy of the circuit, effectively reducing the chip size, reducing the production cost, and will not Due to the asymmetry of the winding, the overall load quality factor of the variable capacitor can also be known during manufacture, so as to further effectively control the overall load quality of the variable capacitor; it does not need to reposition the mutually symmetrical lines position to reduce the difficulty of making.

Description

technical field [0001] The invention relates to an integrated circuit structure of a differential varactor, in particular to an integrated circuit of a differential varactor designed in a combined manner, so that there will be no asymmetry when winding, so as to effectively reduce the The size of the chip is reduced, and the error caused to the circuit is reduced, and the overall load quality of the variable capacitor is further effectively controlled. Background technique [0002] In the application of radio frequency microwave and wireless communication, the voltage controlled oscillator (VCO) has always been an indispensable and important circuit. It uses the bias voltage to change the varactor in the circuit, so that it changes the capacitance value and then changes the oscillation frequency. And more and more people use the differential circuit to design the voltage control oscillator (VCO) circuit to reduce the noise (common-mode noise) interference generated by the co...

AI Technical Summary

Problems solved by technology

[0005] 1. Two independent varactors are used, so a large chip area is required for production, which increases the cost of chip production

[0006] 2. The connection between two independent varactors will have parasitic components, which will increase the uncertainty of the circuit

[0007] 3. Since the connection lines between the two variable containers must be symmetrical to each other, the alignment must be very precise, which will increase the difficulty of production

[0008] 4. The connection between the two variable containers is often asymmetrical, which greatly reduces the effect of the differential

[0009] 5. It is impossible to know the overall load quality factor of the variable capacitor

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