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Description
AD603 Voltage Controlled Amplifier 80dB VCA Module RF IF AGC Module for Modulus Range Extended Signal Measurement
Product Description
This amplifier module is a voltage-controllable gain amplifier, composed of two AD603 cascaded amplifiers, which can amplify the signal voltage amplitude well, and the gain can be adjusted up to 80dB. The user can choose DA input control or manual Sliding control.
Chip Description
The AD603 is a low noise, voltage controlled amplifier for radio frequency (RF) and intermediate frequency (IF) automatic gain control (AGC) systems. It provides accurate pin selectable gains from 11 dB to +31 dB at 90 MHz bandwidth, +9 dB to +51 dB at 9 MHz bandwidth, and any intermediate gain range with an external resistor . The input referred noise spectral density is only 1.3 nV/VHz, and the power consumption is 125 mw when using the recommended taxi 5V power supply. The gain is linear in dB and is precisely calibrated and does not change with temperature and supply voltage. The gain is controlled by a high impedance (50 M2), low bias (200 nA) differential input; the scaling factor is 25 mV/dB, so only 1 V of gain control voltage is required to cover the middle 40 dB of the gain range, regardless of the choice Range, all provide 1 dB over-range and under-range. For a 40 dB change, the gain control response time is less than 1 uS. The differential gain control interface allows differential or single-ended positive or single-ended negative control voltages. Several such amplifiers can be cascaded with their gain control gain bias to optimize system signal-to-noise ratio (SNR). The AD603 can drive load impedances as low as 100Q with low distortion. For a 500 Q load with a 5pF shunt, the total harmonic distortion of a ±1V sinusoidal output is typically 60dBc at 10 MHz. The peak rated output into a 5000 load is 2.5V (min). The AD603's operating temperature range is 40" C to +85.
Chip feature
Linear dB gain control Bandwidth is independent of variable gain Input noise spectral density: 1.3 nV/vHz Gain accuracy: ±0.5dB (typ) All intermediate ranges (eg 1dB to +41 dB, bandwidth: 30 MHz) Pin programmable gain range 11 dB to +31 dB (90 MHz bandwidth) 9 dB to 51 dB (9 MHz bandwidth)
Chip Application
RF / IF AGC Amplifier Video gain control Modulus Range Extended Signal Measurement
2, the maximum gain can be amplified to 1000 times the small signal without distortion, the maximum power supply is ± 7.5V DC.
Specification
item
value
Name
AD603 voltage controllable gain VCA module
Size
50mm X 39mm
Supply voltage range
±5V
Installation Instructions
Maximum gain test at each frequency point
Maximum gain test at each frequency point: (spectrum display) input power: -50dBm 100kHz test signal, output power: 14.14dBm, gain is 64dB 1MHz test signal, output power: 13.94dBm, gain is 64dB 10MHz test signal, output power: 14.00dBm, gain 64dB 20MHz test signal, output power: 9.95dBm, gain 60dB 30MHz test signal, output power: 3.67dBm, gain 53.67dB Maximum gain test at each frequency point: (spectrum display) input power: -20dBm 100KHz test signal, output power: 0.89dBm, gain is 20.89dB 1MHz test signal, output power: 0.89dBm, gain is 20.89dB 10MHz test signal, output power: 2.27dBm, gain 22.27dB 30MHz test signal, output power: -8.42dBm, gain 12dB
AD603 oscilloscope display:
(maximum gain test, input signal amplitude 2mVpp), because the input signal is small, the burr on the waveform is a normal phenomenon. In actual use, if such a situation occurs, the output can be solved by adding a low-pass filter Similar phenomenon.
Waveform integrity, bandwidth test (from low frequency to high frequency, do not look at amplitude, only look at waveform distortion and glitch)
