| With the continuous development of advanced integrated circuit technology,the tunable optical filters based on micro-electro-mechanical technology provides conditions for realizing the tunable detection wavelength and miniaturization of infrared sensors.At the same time of miniaturization,the external acceleration will cause the detected wavelength shift of the tunable infrared sensor,and the closed-loop control system provides a correction signal for this shift error.In order to save power consumption,the closed-loop system correction signal is generated at low power supply voltage,but the tunable optical filters need to be driven by high voltage,so it is of practical significance to research and design the high-voltage output circuit used to drive the tunable optical filters in the closed-loop control system.Based on the circuit requirements of sample-and-hold and high-voltage amplifier,this thesis introduces the theoretical basis of sample-and-hold circuit,such as sampling theorem,sample-and-hold process,sample-and-hold circuit structure and sample-andhold circuit metrics,analyzes the errors related to sampling switch and gives solutions,and points out the necessity of adopting two-stage amplification and collaborative design in high-voltage and low-voltage domains for high-voltage amplifier circuits.Then,the gate voltage bootstrap switch,high-gain operational amplifier,closed-loop high-voltage amplifier circuit and other modules are analyzed related to the circuit design,and the analysis results provide guidance for the subsequent Cadence Spectre simulation verification.In this thesis,two kinds of high-voltage output circuit architectures that meet the functions of sample-and-hold and high-voltage amplification are proposed.According to the overall metrics and design practicability of the circuit,the respective sample-and-hold circuit architectures are selected,and the design metrics is refined by analyzing the related errors of the two circuit architectures,and the two are compared in terms of power consumption,area and design complexity.In the combined circuit architecture,a circuit and timing to avoid the breakdown of low-voltage differential input transistors by high voltage are proposed,which saves about half the power consumption compared with the cascade architecture.In this thesis,the bootstrap switch,high-gain operational amplifier,capacitor fliparound sample-and-hold circuit and high-voltage amplifier module are simulated and verified using a 0.18μm BCD process,and the two high-voltage output system architectures are simulated and verified under the conditions of 5μs sampling period and peak-to-peak 1.5V input signal.The simulation results show that the high-voltage output meets the output swing of 0.5V～30.5V,and the settling error is less than 0.03 V within2.5μs,the total harmonic distortion is lower than-70 d B,and the spurious-free dynamic range is greater than 70 d Bc. |
