A high performance transceiver chipset for millimeter-wave commercial digital communication systems

Sharma, Arvind Kumar; Smith, Daniel M.; Aust, M.V.; Katz, R.; Yonaki, J.; Womack, R.B.; Bindenbender, M.D.

doi:10.1109/mcs.1995.470994

Cited by 7 publications

(1 citation statement)

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“…■ Inder J. Bahl D etectors are used in a wide variety of applications [1]- [5] in microwave systems as a source of a dc (or a low video frequency) voltage that is proportional to the amplitude of an RF signal. These applications include automatic gain control, automatic level control, signal strength indicators, AM modulation detection, status indicators, and power monitors.…”

Section: Broadband Power Detectorsmentioning

confidence: 99%

Application notes - Broadband Power Detectors

Bahl

2007

IEEE Microwave

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D etectors are used in a wide variety of applications [1]- [5] in microwave systems as a source of a dc (or a low video frequency) voltage that is proportional to the amplitude of an RF signal. These applications include automatic gain control, automatic level control, signal strength indicators, AM modulation detection, status indicators, and power monitors. In several microwave applications one needs power detectors to monitor or sense the transmitter's output power or control it. Figure 1 shows a simplified schematic of a power detection and control circuitry [4]. A diode-based method is the simplest way for power detection. Detectors make use of the nonlinear characteristics of devices to generate an output signal containing many frequency components. By proper filtering, the dc component is separated and is used for power monitoring component. This works on a principle of a rectifier diode. This device is placed in shunt at the output stage of the amplifier. Figure 2 shows two simplified schematics of a power detection circuit, where the power is sampled by using a 15-20 dB coupler or sampled using a high impedance Z network. The value of isolation impedance Z, in a 50 system, is selected such that the power flowing through Z and the diode is negligible and does not load the main circuit. The value of Z is adjusted so that the sampled power is 15-20 dB below the output power P out . The capacitive type sampling has a larger bandwidth potential than resistive or inductive. In this application note we describe Schottky diode-based power detectors to obtain a required detected voltage. In our application, we have chosen typically about 4 V detected voltage when the sampled power is about 17-18 dBm at the detector interface.

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Section: Broadband Power Detectorsmentioning

confidence: 99%