Multiplexing delay unit circuit

Abstract

The invention discloses a multiplexing delay unit circuit, and aims to implement a delay unit circuit with multiplexing function, implement a loop oscillator of different delay unit stages with as low design overhead as possible and acquire multiple oscillator gains. The invention adopts the technical scheme that: the signal input end of a delay unit is connected with an analog switch circuit; and the analog switch circuit consists of a first analog switch K1 and a second analog switch K2, wherein the K1 is connected with a first input signal IN1 under the control of a first control signal C1, the K2 is connected with a second input signal IN2 under the control of a second control signal C2, and the other ends of the K1 and the K2 are connected with the signal input end of the delay unit. The multiplexing delay unit circuit can receive two paths of input; and an oscillator consisting of the multiplexing delay unit circuit can provide multiple gains, and the area and the power consumption overhead of the oscillator are greatly reduced compared with a conventional variable gain oscillator.

Description

[0001] technical field [0002] The invention belongs to the field of integrated circuit design and is applied to a delay unit circuit of a ring oscillator, in particular to a reusable delay unit circuit. Background technique [0003] Ring oscillators are widely used in various integrated circuits. The range of frequency tuning and the speed of frequency tuning are important parameters to measure the performance of the ring oscillator. With the advancement of electronic manufacturing technology and the improvement of people's requirements for the operating frequency and response speed of integrated circuits, ring oscillators that can achieve a wide frequency tuning range and multiple gains are increasingly favored by the industry. Therefore, the ring oscillator with multiple gains and wide frequency tuning range is the development trend of today's oscillator technology and has a great application prospect. [0004] figure 1 A multistage ring oscillator based on a conventi...

AI Technical Summary

Problems solved by technology

[0008]1. A ring oscillator consisting of a conventional delay unit (e.g. Figure 1), the number of delay unit stages is fixed, and the output frequency can only be adjusted by changing the control voltage, and the adjustment range of the output frequency is limited;

[0009]2. A variable gain oscillator formed by changing the number of delay units (such as Figure 2), the output frequency can be adjusted by changing the gain, but it requires a large number of delay units, resulting in excessive area and power consumption big

[0010]3. A variable gain oscillator implemented by a variable capacitor array (such as As shown in Figure 3), the output frequency can also be adjusted by changing the gain, but it requires a large amount of capacitance, and the area and power consumption are relatively large

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