A bipolar pi-type pin diode electronically adjustable attenuator

Abstract

The invention provides a bipolar PI type PIN diode electric adjustable attenuator. The electronically adjustable attenuator includes a radio frequency signal input interface, a transmission line transformer, a PIN diode changeover switch, a unipolar PI type PIN diode electronically adjustable attenuator, a radio frequency signal output interface, a control signal input interface, a switch drive circuit, an absolute value conversion circuit, an electrical Adjustable drive circuit, DC bias circuit; the present invention realizes the decoupling control of the forward conduction current and the reverse cut-off voltage of the switch PIN diode through the PIN diode conversion switch and the absolute value circuit, as well as the unipolar PI type PIN diode electric adjustment attenuation double The self-adaptive control of the polarization reduces the minimum insertion loss of the main radio frequency channel, simplifies the double PI type parallel ESC attenuator into a single PI type ESC attenuator, reduces the amount of main components and saves the cost.

Description

technical field [0001] The invention belongs to the field of communication technology and electromagnetic compatibility, and in particular relates to a bipolar PI type electronically adjustable attenuator, which is especially suitable for automatic gain control. Background technique [0002] Bipolar electronically adjustable attenuators are often used in the fields of communication and electromagnetic compatibility, but the design method needs to be further improved. The traditional method generally uses two parallel PI-type PIN diode ESCs to achieve bipolarity. The RF signal is divided into two paths through a power divider at the RF input end, one path is directly output to the PI-type attenuator, and the other path is passed through an inverter. It is then output to another PI attenuator, and the two signals are combined by a synthesizer at the RF output. Use the control signal to control the on and off of the two signals respectively. When the control signal is positive...

AI Technical Summary

Problems solved by technology

The insertion loss of the traditional bipolar PI type PIN diode ESC attenuator is large, only the minimum insertion loss of the power divider and combiner is at least 6dB, and the insertion loss of the ECA attenuator should not be too large when the input power is limited, otherwise it will The maximum output power of the electronically adjustable attenuator is too small, which is an important factor that must be considered when using a bipolar electronically adjustable attenuator

In addition, the bipolar attenuator uses two parallel PI type PIN diode attenuators, which not only wastes components but also increases the cost

[0003] Since the bipolar electronically adjustable attenuator is widely used in the field of communication and electromagnetic compatibility, it is directly related to the superior performance of many devices and equipment, and the traditional bipolar electronically adjustable attenuator has large insertion loss and high cost, so it is necessary to develop A bipolar electronically adjustable attenuator, which overcomes the defects of existing methods, reduces insertion loss and reduces cost

Images