Fluidic Ring Oscillator

Abstract

The invention discloses a flow control ring oscillator. The oscillator comprises N delay units which are successively and sequentially connected and the N is an odd number which is greater than 1. Each delay unit comprises a first field effect transistor, a second field effect transistor, a third field effect transistor, a fourth field effect transistor, a fifth field effect transistor, a sixth field effect transistor and a current source. Grid electrodes of the first field effect transistor and the second field effect transistor are connected. Source electrodes of the first field effect transistor and the fourth field effect transistor are connected to one end of the current source. The other end of the current source is connected to an external power supply. Drain electrodes of the first field effect transistor and the second field effect transistor are connected. A source electrode of the second field effect transistor is connected to a drain electrode of the third field effect transistor. An external voltage signal is input into grid electrodes of the third field effect transistor and the sixth field effect transistor. Grid electrodes of the fourth field effect transistor and the fifth field effect transistor are connected. Drain electrodes of the fourth field effect transistor and the fifth field effect transistor are connected. A source electrode of the fifth field effect transistor is connected to a drain electrode of the sixth field effect transistor. The flow control ring oscillator has low common mode interference sensitivity to a power supply and ground so that an anti-noise capability is increased and an application scope is wide.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a flow control ring oscillator. Background technique [0002] Usually, a ring oscillator is formed by connecting an odd number of delay units end to end, such as figure 1 shown, and figure 1 The ring oscillator shown consists of 3 delay cells. [0003] like figure 1 In the shown prior art ring oscillator, assuming that the signal transmitted in the ring oscillator passes through the delay time of each delay unit is Td, and the number of delay units is N, then the output frequency of the ring oscillator is F=1 / (2*N*Td). In order to control the output frequency of the ring oscillator in real time, it can be realized by changing the delay time Td. The flow-controlled ring oscillator is to control the input current of the delay unit to change the delay time Td, so as to achieve the purpose of controlling the output frequency of the ring oscillator. Therefore, the design of t...

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Problems solved by technology

[0009] As mentioned above, once the current-controlled ring oscillator of the prior art is made, its frequency varies with the gain of the current (ie ) is fixed, and the gain is equal to The gain of the flow-controlled ring oscillator directly determines the variation range of its output frequency F, because the gain of the prior art cannot be changed, so its application range is limited; and the output of the flow-controlled ring oscillator of the above-mentioned prior art The signal is single-ended output, and the single-ended output signal is highly sensitive to common-mode interference of power supply and ground, and has poor anti-noise characteristics

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