接收器保护器中的pin限幅二极管-PINLimiterDiodesin讲述.PDFVIP

APPLICATION NOTE IN Limiter Diodes in Receiver rotectors Introduction A Simple Limiter Circuit Radio and radar receivers must be capable of processing very A simple, passive receiver protection limiter is shown in Figure 2. small signals, necessitating the use of very sensitive circuit In its most fundamental form, this circuit consists of a PIN diode blocks that can contain fragile semiconductors. Many of these and an RF choke inductor, both of which are in shunt with the systems must also be capable of surviving very large incident main signal path. In most limiter circuits, C blocking capacitors signals, without damage to the sensitive components they are included at the input and the output of the circuit. A single- contain. The receiver protection limiter, most often referred to stage limiter can typically reduce the amplitude of a large input simply as a limiter, can protect the receiver from large input signal by 20–30 dB. signals and also allow the receiver to function normally when these large signals are not present. DC DC Block Block Limiters are most often employed in radar transceivers, whose Input Output transmitters and receivers are tuned to the same frequency. The Limiter RF transmitter produces a signal, the peak level of which is in mos