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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Current/Voltage Controlled Quadrature Sinusoidal Oscillators for Phase Sensitive Detection Using Commercially Available IC
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Current/Voltage Controlled Quadrature Sinusoidal Oscillators for Phase Sensitive Detection Using Commercially Available IC

机译：使用市售IC进行电流/电压控制的正交正弦波振荡器进行相位敏感检测

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摘要

This paper presents the quadrature sinusoidal oscillators for a phase sensitive detection (PSD) system. The proposed oscillators are design by using the commercially available ICs (LT1228). The core oscillator consists of three LT1228s: two grounded capacitors and one resistor. By adding four resistors without the requirement of additional active devices, the amplitudes of two quadrature waveforms become adjustable. The quadrature output nodes are of low impedance, which can be connected to the impedance sensor or other circuits in a phase sensitive detection system without the need of buffer devices. The amplitudes of the quadrature waveform are equal during the frequency of oscillation (FO) tuning. The frequency of oscillation is electronically and linearly controlled by bias current or voltage without affecting the condition of oscillation (CO). Furthermore, the condition of oscillation is electronically controlled without affecting the frequency of oscillation. The performances of the proposed oscillators are experimentally tested with ±5 voltage power supplies. The frequency of the proposed sinusoidal oscillator can be tuned from 8.21 kHz to 1117.51 kHz. The relative frequency error is lower than 3.12% and the relative phase error is lower than 2.96%. The total harmonic distortion is lower than −38 dB (1.259%). The voltage gain of the quadrature waveforms can be tuned from 1.97 to 15.92. The measurement results demonstrate that the proposed oscillators work in a wide frequency range and it is a suitable choice for an instrument-off-the-shelf device
机译：本文介绍了用于相敏检测（PSD）系统的正交正弦振荡器。拟议的振荡器是通过使用商用IC（LT1228）设计的。核心振荡器由三个LT1228组成：两个接地电容器和一个电阻器。通过添加四个电阻而无需其他有源器件，两个正交波形的幅度就可以调节。正交输出节点具有低阻抗，可以将其连接到相敏检测系统中的阻抗传感器或其他电路，而无需缓冲设备。在振荡（FO）调谐频率期间，正交波形的幅度相等。振荡频率由偏置电流或偏置电压以电子方式线性控制，而不影响振荡条件（CO）。此外，在不影响振荡频率的情况下，对振荡条件进行电子控制。所提出的振荡器的性能已通过±5电压电源进行了实验测试。所提出的正弦振荡器的频率可以从8.21 kHz调整到1117.51 kHz。相对频率误差小于3.12％，相对相位误差小于2.96％。总谐波失真低于-38 dB（1.259％）。正交波形的电压增益可以从1.97调整到15.92。测量结果表明，所建议的振荡器可在较宽的频率范围内工作，是现成仪器的合适选择

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