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Bootstrap fet driven with on-chip power supply

阅读：705发布：2022-07-26

专利汇可以提供Bootstrap fet driven with on-chip power supply专利检索，专利查询，专利分析的服务。并且A bootstrap FET driver amplifier having a precharged relatively higher gate voltage and a relatively lower drain voltage obtained from a common power source. The gate voltage is derived from recurrent pulses produced by an on-chip FET free-running multivibrator and a voltage multiplier circuit powered from said power source. The pulse width of the recurrent pulses varies as an inverse function of the transconductance of the on-chip FETs and as a direct function of the threshold voltage of the on-chip FETs. The pulse width controls the charging time of a voltage booster capacitor in the voltage multiplier circuit whereby the amplitude of the boosted voltage is a direct function of the pulse width. The boosted voltage is applied to the gate of the bootstrap FET driver amplifier.，下面是Bootstrap fet driven with on-chip power supply专利的具体信息内容。

权利要求

1. Apparatus comprising: a boot strap field effect transistor driver formed in an integrated circuit, said driver having gate, drain and source electrodes, a source of voltage coupled to said drain electrode, on-chip means formed in said integrated circuit for delivering a gate voltage higher than said voltage of said source; said means comprising a multi-vibrator coupled to said source and producing an output recurrent pulsed waveform, the width of said waveform varying inversely with the transconductance of and directly with the threshold voltage of said field effect transistor driver, a voltage multiplier circuit including a voltage booster capacitor, switching means in said multiplier circuit coupled to receive said pulsed waveform for controlling the charging time of said capacitor, said capacitor being charged by said source when said switching means is conductive, one side of said capacitor being selectively coupled to said source when said switching means is conductive and the other side of said capacitor being coupled to said source when said switching means is not conductive; and means for coupling said one side of said capacitor to said gate electrode of said boot stRap driver.

2. The apparatus defined in claim 1 wherein said voltage multiplier circuit comprises field effect transistors.

3. The apparatus defined in claim 1 wherein said means for coupling comprises a diode-connected field effect transistor poled to isolate said capacitor from said gate electrode when said capacitor is being charged.

4. The apparatus defined in claim 1 wherein said multivibrator circuit comprises a cascaded plurality of resistance-capacitance delay network segments, each segment comprising a pair of field effect transistors connected in series circuit to said source, one of said field effect transistors being diode-connected, and a capacitor connected to the junction between said pair of field effect transistors.

5. The apparatus defined in claim 1 wherein said multivibrator circuit comprises a pair of cross-connected field effect transistors respectively shunted by a pair of set and reset field effect transistors, said field effect transistors having gate, drain and source electrodes, and a pair of resistance-capacitance delay networks respectively coupled between the drain and gate electrodes of said set and reset field effect transistors.

6. The apparatus defined in claim 5 wherein each said resistance-capacitance delay network comprises a cascaded plurality of resistance-capacitance delay network segments, each segment comprising a pair of field effect transistors connected in series circuit to said source, one of said field effect transistors being diode-connected, and a capacitor connected to the junction between said pair of field effect transistors.

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Bootstrap fet driven with on-chip power supply

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