AD8367 is a variable gain medium frequency amplifier based on the X-AMP structure of ADI company. It is composed of a 9 order resistance attenuation network and a fixed gain amplifier. It can achieve accurate logarithmic linear gain control and gain control range of 45 dB. It can not only configure the traditional VGA mode applied to the applied voltage control, but also the same VGA mode. The square law detector is integrated inside the system, so it can also work in the automatic gain control mode. The typical working frequency range of AD8367 is within 500 MHz, and there are two modes of work: positive gain mode (MODE terminal high level) and negative gain mode (MODE terminal low level). The analog gain control voltage range is 50mV ~950mV, the control sensitivity is 20mV/dB, and the gain is through gain. The control terminal MODE can set AGC as a positive gain control mode or a negative gain control mode to match the characteristics of a logarithmic amplifier to form a stable negative feedback AGC circuit with a stable performance. When working Yu Zheng and negative gain control mode, the relationship between the logarithmic gain and the linear control voltage of AD8367 is: positive gain mode: G =50Vc-5 (dB), negative gain mode: G =45-50Vc (dB), G is gain, unit dB; Vc is control voltage, unit is volt. The module has shielding shell and anti reverse protection diode.

Technical indicators

1, supply voltage: +5V DC (typical current value 200mA/ maximum gain output).

2, working frequency: DC-500MHZ, input and output impedance: 50 ohms;

3. Maximum output amplitude: 27dBm (200 Ohm)

4, variable gain range: 46dB (see S21 curve for specific curves)

5, control voltage range (0-1VDC), internal potentiometer can be selected, or additional DA program control.

6. Provide PDF stall schematic diagram

7. Can be configured as AGC mode and VCA mode

Pattern setting:

VCA mode: voltage control variable gain mode as shown in Figure 4.1, positive slope control mode (J7, J4 short circuit, J6, J2 opening, VCA control (positive slope)); negative slope control mode (J7, J2 short circuit, J4, J6 open, VCA control (negative slope))

AGC mode: the automatic gain control mode is shown in Figure 4.1, the jumper setting (J6, J2 short circuit, disconnecting J7, J5, J9, AGC control).