Variable Gain 200 MHz Wideband Voltage Amplifier
Features
Variable gain 10 to 60 dB (x3 to x1,000), switchable in 10 dB steps
Bandwidth DC ... 200 MHz, switchable to 20 MHz
Built-in temperature compensation for low offset drift of 0.3 µV/°C
2.3 nV/√Hz input noise
Switchable AC/DC-coupling
Bandwidth, frequency- and pulse response independent of gain setting
Local and remote control
DC monitor output
Applications
Oscilloscope and transient-recorder preamplifier
Photomultiplier and microchannel-plate amplifier
Signal-booster for optical receivers and current amplifiers
Time-resolved pulse and transient measurements
Automated measurement systems
Integration in compact systems
Block Diagram
Specifications
Test conditions
VS = ±15 V, TA = 25 °C, system impedance = 50 Ω
Gain
Gain values
10, 20, 30, 40, 50, 60 dB, switchable
Gain accuracy
±0.15 dB
Frequency Response
Lower cut-off frequency
DC / 10 Hz, switchable
Upper cut-off frequency
200 MHz, switchable to 20 MHz (approx. Bessel filter characteristic for clean pulse response)
Upper cut-off frequency roll-off
see frequency response diagram
Time Response Rise/fall time (10 % - 90 %)
1.8 ns (@ 200 MHz) 18 ns (@ 20 MHz)
Input
Input impedance
50 Ω
Input return loss S11
–31 dB @ 100 MHz
–22 dB @ 200 MHz
–10 dB @ 400 MHz
Input voltage drift
0.3 µV/°C
Equivalent input voltage noise
2.3 nV/√Hz (@ 30 - 60 dB gain)
Equivalent input current noise
3.0 pA/√Hz
1/f-noise corner
20 kHz
Input bias current
<200 nA
Input offset voltage
–10 mV ... +10 mV, adjustable by offset- potentiometer and external control voltage
Output
Output impedance
50 Ω (terminate with 50 Ω load for best performance)
Output return loss S22
–35 dB @ 100 MHz
–30 dB @ 200 MHz
–25 dB @ 400 MHz
Output voltage range
2 VPP (for linear amplification)
Output power (max.)
+10 dBm
Output current (max.)
70 mA
THD
<0.5 % (@ 20 MHz, 1 VPP)
Monitor Output
Monitor output gain
x1 (@ ≥1 MΩ load)
Monitor output voltage range
±5 V
Monitor output current
±10 mA
Monitor output bandwidth
DC ... 100 kHz
Monitor output impedance
50 Ω (designed for ≥ 1 MΩ load)
Indicator LED
Function
gain setting
Digital Control
Control input voltage range
Low: –0.8 ... +0.8 V High: +1.8 ... +12 V, TTL / CMOS compatible
Control input current
0 mA @ 0 V, 1.5 mA @ +5 V, 4.5 mA @ +12 V
Gain control switching time
5 ms
Ext. Offset Control Control voltage range
±10 V, corresponds to ±10 mV input offset
Offset control input impedance
20 kΩ
Power Supply
Supply voltage
±15 V
Supply current
±120 mA typ. (depends on operating conditions) ±400 mA max.
Stabilized power supply output
±12 V / max. 50 mA, +5V / max. 50 mA
Case
Weight
560 g (1.24 lb)
Material
AlMg4.5Mn, nickel-plated
Temperature Range
Storage temperature
–40 °C ... +85 °C
Operating temperature
0 °C ... +50 °C
Absolute Maximum Ratings
Power supply voltage
±16.5 V
Signal input voltage
±5 V
Digital control input voltage
+16 V / –5 V
Connectors
Input
BNC jack (female)
Output
BNC jack (female)
Power supply
Lemo® series 1S, 3-pin fixed socket (mating plug type: FFA.1S.303.CLAC52)
Pin 1: +15 V
Pin 2: –15 V
Pin 3: GND
Control port
Sub-D 25-pin, female, qual. class 2
Pin 1: +12 V (stabilized power supply output)
Pin 2: –12 V (stabilized power supply output)
Pin 3: AGND (analog ground)
Pin 4: +5 V (stabilized power supply output)
Pin 5: monitor output
Pin 6, 7: NC
Pin 8: offset control voltage input
Pin 9: DGND (ground f. digital control pin 10 - 25)
Pin 10: digital control input: gain, LSB
Pin 11: digital control input: gain
Pin 12: digital control input: gain, MSB
Pin 13: digital control input: AC/DC
Pin 14: digital control input: 200 MHz/20 MHz
Pin 15 - 25: NC
Remote Control Operation
General
Remote control input bits are opto-isolated and connected by logical OR to local switch setting. For remote control a switch setting, set the corresponding local switch to “Ext.”, “AC” or “20 MHz” and select the wanted setting via a bit-code at the corresponding digital inputs. Mixed operation, e.g. local gain setting and remote controlled bandwidth setting is also possible.
Gain setting
Gain
Pin 10
Pin 11
Pin 12
10 dB
low
low
low
20 dB
high
low
low
30 dB
low
high
low
40 dB
high
high
low
50 dB
low
low
high
60 dB
high
low
high
AC/DC setting
Coupling
Pin 13
AC
low
DC
high
Bandwidth setting
Bandwidth
Pin 14
20 MHz
low
200 MHz
high
Typical Performance Characteristics
Frequency Frequency response esponse (logarithmic)
Dimensions
One or both heat sinks may be removed (two recessed head screws) if sufficient cooling of the case is provided otherwise (< 2 K/W), for example by mounting the amplifier with good thermal contact on a sufficiently large solid metal case/rack system..
商品属性 [频率] DC ... 200 MHz [可变增益] 10 to 60 dB [电压噪声] 2.3 nV/√Hz