NIM Model 127FL Dual Bipolar Linear Fan-in
NIM Model 127FL Dual Bipolar Linear Fan-in
The LRS Model 127FL is a fast, versatile bipolar linear fan-in featuring unity gain, non-inverting operation, direct-coupled circuit design and freedom from duty cycle limita- tions and rate effects. The Model 127FL operates as either a dual 8-fold linear fan-in or as a single 16-fold linear fan-in. With rise and fall times of -- 2.5 ns and an absolute delay of less than 4 ns, the Model 127FL may be used to combine nanosecond pulses from as many as sixteen different sources. All inputs are terminated in 50 Ohm. Pulses may be applied separately or simultaneously to one or both channels; channel inputs and outputs at ground potential allow compatible interconnection between units. The current source output stage permits paralleling, by external cables, a large number of similar high-output impedance channels. The front-panel MIXED switch connects Channel A output to Channel B output. The output amplitude of each channel is the algebraic sum of the input amplitudes. Negligible stretching on overload allows use as a logic fan-in of NIM level inputs.
Offering integral linearity of better than 1% over a range from 0 to +/-1volt, the 127FL features two bridged outputs per channel, eliminating the need for an external fan-out when driving both ADC and discriminator inputs. The maximum output amplitude characteristic of the 127FL is +2.4 volts and - 1.6 volts into 50 Ohm. When both connectors of the bridged outputs are terminated into 50 Ohm, each delivers a half amplitude signal into its load.
NIM Model 127FL Dual Bipolar Linear Fan-in
Specifications
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INPUT CHARACTERISTICS |
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Number of Channels: |
Two. |
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Inputs: |
8 per channel; direct coupled. (Unused inputs need not be terminated.) |
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Impedance: |
50 Ohm. |
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Polarity: |
Positive or negative. |
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Reflection Coefficient: |
Less than 7% for inputs of 2 ns risetime. |
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Input Protection: |
Inputs protected against 10 iis transient overloads, up to +/-100 volts. DC overload characteristics are determined by the 500 mW dissipation limit of the 50 Ohm. terminating resistors. |
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OUTPUT CHARACTERISTICS |
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Outputs: |
Two per channel, bridged: full amplitude output is delivered into 50 Ohm; if both connectors used, half amplitude is delivered into each 50 Ohm load. Direct- coupled; current source. |
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Maximum Amplitude: |
Linear region, +/-20 mA (+/- 1.0 volts into 50Ohm). Limits at +48 mA (+2.4 volts into 502) and -32 mA (-1.6 volts into 502). |
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Risetimes and Falltimes: |
-- 2.5 ns, 10% to 90%, with one output per channel terminated in 50 Ohm (slightly faster with both terminated). |
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Overshoot: |
-- 7% for 1 ns, +/- 800 mV input pulses. |
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Current Gain: |
1 +/- 2% into 50 Ohm for -- 20 mA; 3 dB point at 150 MHz. |
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Duty Cycle Limitations: |
None. |
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Noise: |
-- 750 microvolts RMS. |
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D.C. Offset: |
Adjustable with front-panel potentiometer. |
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D.C. Offset Stability: |
Better than 0.25 mV/'C and <4 mV/% of variation of any power supply (with 50 Ohm load). |
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Stage Delay: |
4 ns. |
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Overload Recovery: |
Approximately 1 ns with eight simultaneous NIM level (-800 mV) inputs. |
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Non-Linearity: |
Less than 1 % over operating range of 0 to +/- 1.0 volts; (<5% to +/- 1.5 volts). |
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GENERAL |
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Output Mixing: |
A front panel switch combines the outputs of the two 8-input channels to provide one 16-input channel. |
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Packaging: |
RF shielded AEC/NIM #1 module; dimensions 1.375 x 8.75 x 10 inches deep. LEMO-type connectors. |
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Current Requirements: |
+ 24 volts at 25 mA, |