Reducing AC impedance measurement errors caused by the DC voltage dependence of broadband high-voltage bias-tees

Abstract

Abstract-During the AC impedance characterization of devices, from the kHz-range up to the GHz-range, accuracy can be lost when a DC voltage is applied. Commercial high-voltage broadband bias-tees are often voltage-dependent, which can cause inaccuracies at low frequencies. A calibration technique with applied bias significantly improves the measurement accuracy. Additionally, a bias-tee has been developed with a voltageindependent capacitor, suitable for DC voltages up to 500 V showing excellent performance up to several gigahertz. PIN diode limiters protect the measurement equipment from damage in case of a device breakdown.

Integration of GMR-based spin torque oscillators and CMOS circuitry

“…The topology of the required on-chip bias-tee is determined by the amount of DC current required by the device. For devices that require DC currents less than 10 mA, the resistor-capacitor (RC) bias-tee is preferred since it offers flat impedance over a wide frequency range, while producing only a small voltage drop across the resistor and dissipating low power [26,27]. In this work, the bias-tee should handle a DC current larger than 22 mA, making the RC bias-tee not applicable.…”

10Gb/s burst-mode driver circuit with on-chip bias switch for in-Vehicle optical networks

“…In contrast, wide-band bias tees using a high resistance value have been proposed [20], [21]. Figure 2 illustrates a conventional circuit configuration, where, 𝑍 in,GW represents the input impedance of the GW device.…”

Tailoring strain in microelectronic devices

“…voltage, bias-T [47]. Commercial bias-Tees generally contain a ferroelectric capacitor, which has a strongly bias dependent capacitance.…”