Ultra-low voltage cold start oscillator delay unit based on deep trap MOS tube

Abstract

The invention discloses an ultra-low voltage cold start oscillator delay unit based on a deep trap MOS tube. The delay unit comprises PMOS (P-channel Metal Oxide Semiconductor) tubes M1, M3 and M5 andNMOS (N-channel Metal Oxide Semiconductor) tubes M2, M4 and M6, which are manufactured by adopting a deep trap process, wherein substrates of the M1 and M2, substrates of the M3 and M4 and substratesof the M5 and M6 are respectively connected, and a signal input end Vin of the delay unit is connected to the substrates of the PMOS tubes and the NMOS tubes; the gate electrodes of M1 and M2, the gate electrodes of M3 and M4 and the gate electrodes of M5 and M6 are respectively connected and then connected to a signal input end Vin of the delay unit, a drain electrode of M1 is connected with a drain electrode of M2 and serves as a common drain electrode X port, a source electrode of M1 is connected with a power supply, and a source electrode of M2 is grounded. Under the condition of ensuringlow input power supply voltage, the output voltage swing of the delay unit is improved, the direct-current gain of the delay unit is increased, and oscillation can be generated under lower power supply voltage.

Description

technical field [0001] The invention relates to an ultra-low voltage cold-start oscillator delay unit based on a deep-well MOS transistor, which belongs to the technical field of integrated circuits. Background technique [0002] Harvesting energy from ambient sources, such as human body temperature, is an attractive proposal to power battery-free wearable electronics. Although this proposal is feasible from an energy point of view, the initial start-up of millivolt-scale thermoelectric generators in energy-harvesting circuits remains a challenge. One way to increase this low input voltage is to use a low voltage oscillator to start a higher voltage dc-dc converter. [0003] In order to obtain a start-up signal working at a low voltage, conventional thermoelectric energy harvesters use a standard ring oscillator to generate a start-up clock signal. But it can only provide a fully self-powered solution for higher temperature differences (>10°C), not a typical solution fo...

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Problems solved by technology

But it can only provide a fully self-powered solution for higher temperature differences (>10°C), not a typical solution for wearable devices

In addition, in most sub-micron CMOS processes, a self-starting ring oscillator using an inverting delay cell usually requires a supply voltage of several hundred millivolts, which is not suitable for starting a battery-less thermoelectric energy harvester. Powering Wearable Electronics

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