- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄375234 > AD602JRZ-RL (ANALOG DEVICES INC) Dual, Low Noise, Wideband Variable Gain Amplifiers PDF資料下載
參數(shù)資料
| 型號： | AD602JRZ-RL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Dual, Low Noise, Wideband Variable Gain Amplifiers |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| 封裝： | LEAD FREE, MS-013AA, SOIC-16 |
| 文件頁數(shù)： | 26/28頁 |
| 文件大?。?/td> | 432K |
| 代理商： | AD602JRZ-RL |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁當前第26頁第27頁第28頁
AD600/AD602
For the next 40 dB of control range, the gain of U1A remains
fixed at its maximum value of 41.07 dB and only the gain of
U1B is varied, while that of U2A remains at its minimum value
of 1.07 dB. In this interval, the fixed output noise of U1A is
amplified by the increasing gain of U1B and the SNR
progressively decreases.
Rev. E | Page 26 of 28
Once U1B reaches its maximum gain of 41.07 dB, its output
also becomes a gain independent noise source; this noise is
presented to U2A. As the control voltage is further increased,
the gains of both U1A and U1B remain fixed at their maximum
value of 41.07 dB, and the SNR continues to decrease. Figure 56
clearly shows this, because the maximum SNR of 90 dB is
extended for the first 40 dB of input signal before it starts to roll off.
This arrangement of staggered gains can be easily implemented
because when the control inputs of the AD600 are overdriven,
the gain limits to its maximum or minimum values without side
effects. This eliminates the need for awkward nonlinear shaping
circuits that have previously been used to break up the gain
range of multistage AGC amplifiers. The precise values of the
AD600’s maximum and minimum gain (not 0 dB and +40 dB
but 1.07 dB and +41.07 dB) explain the rather odd values of
the offset values that are used.
The optimization of the output SNR is of obvious value in AGC
systems. However, in applications where these circuits are
considered for their wide range logarithmic measurement
capabilities, the inevitable degradation of the SNR at high gains
need not seriously impair their utility. In fact, the bandwidth of
the circuit shown in Figure 47 was specifically chosen to improve
measurement accuracy by altering the shape of the log error
curve at low signal levels (see Figure 53).
相關PDF資料 |
PDF描述 |
|---|---|
| AD606 | 50 MHz, 80 dB Demodulating Logarithmic Amplifier with Limiter Output(50MHz,帶限幅輸出80dB解調(diào)對數(shù)放大器) |
| AD607ARS | Low Power Mixer/AGC/RSSI 3 V Receiver IF Subsystem |
| AD607 | Low Power Mixer/AGC/RSSI 3 V Receiver IF Subsystem(低功耗混合器/AGC/RSSI 3V接收器IF子系統(tǒng)) |
| AD608AR | CAP CERAMIC 120PF 50V NP0 0805 |
| AD608 | Low Power Mixer/Limiter/RSSI 3 V Receiver IF Subsystem(低功耗混合器/Limiter/RSSI 3V接收器IF子系統(tǒng)) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD602SQ/883B | 制造商:Rochester Electronics LLC 功能描述:VARIABLE GAIN AMP IC - Bulk |
| AD603 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Noise, 90 MHz Variable Gain Amplifier |
| AD603_05 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Noise, 90 MHz Variable Gain Amplifier |
| AD603_07 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Noise, 90 MHz Variable Gain Amplifier |
發(fā)布緊急采購，3分鐘左右您將得到回復。