Krohn Hite 30A-3

DESCRIPTION The Model 30A Series low-pass, elliptical filter/voltage gain amplifier is one of many plug-in filter cards used in the Models 3905B/3905C/3916B/3916C Programmable Filter Systems chassis.

FILTER FEATURES As an elliptical  filter, the Model 30A Series has a tunable cutoff frequency range from 0.01Hz to 99kHz, a roll-off rate of 115dB/octave and a minimum stopband attenuation of >80dB. Pass- band ripple is typically 0.22dB.

The 30A provides either a single-ended or differential input with a common mode rejection of >60dB. Input gains up to 40dB in 10dB steps and output gains to 20dB are also provided. The 30A will accept input signals of ±10V peak at 0dB gain and has selectable ac or dc coupling. Overload detectors are standard and assist the user in detecting excessive input signals or incorrect gain settings.

AMPLIFIER FEATURES The 30A is also a programmable voltage gain amplifier for applications that require a low noise amplifier. The amplifier has a bandwidth of 1MHz and gains to 60dB, selectable in 10dB steps, and a wideband noise of <25 V.

APPLICATIONS Typical applications for the Model 30A are: anti-aliasing in digital signal processing, separating specific bandwidths of information, enhancing signal-to-noise ratio, low noise pre-amplification and many more. Plug-in cards offering other types of filters with different frequency ranges, slopes and number of channels are also available.

SPECIFICATIONS

FUNCTIONS: Low-pass filter; voltage gain amplifier.

FILTER MODE Type: 7-pole, 6-zero elliptical. Attenuation Slope: 115dB/octave. Passband Ripple: 0.22dB typical, 0.4dB max. Tunable Frequency Range fc:    Model 30A-1: 1Hz to 99kHz.    Model 30A-2: 0.1Hz to 9.9kHz.    Model 30A-3: 0.01Hz to 990Hz.

Relative Gain at fc: –0.22dB at 1.01fc nominal. Cutoff Frequency Accuracy: ±2%. Bandwidth: dc coupled, dc to fc; ac coupled, 0.32Hz to fc. Stopband Attenuation: >80dB. Stopband Frequency (fs): 1.7fc. Insertion Loss: 0dB ±0.1dB. Pre-Filter Gain: 0dB, 10dB, 20dB, 30dB, 40dB ±0.1dB. Post-Filter Gain: 0dB, 10dB, 20dB ±0.1dB. Input Coupling: ac or dc. Wideband Noise (RTI with 2MHz BW Detector): min. gain, 1kHz cutoff <400 V, max fc, <1mV; Max. gain, <20 V. Harmonic Distortion: –80dB at 1kHz. Intermodulation Distortion: –80dB below full scale volts at  0.7 and 0.9 of max input frequency. Spurious Components: –80dB below full scale with input source <50 ohms. DC Stability: Typically ±10 V/ C. Crosstalk Between Channels: –85dB below full scale with input source <50 ohms.

AMPLIFIER MODE Bandwidth: dc coupled, dc to >1MHz min. gain, >400kHz max. gain; ac coupled, 0.32Hz to >1MHz min gain, 0.32Hz to >400kHz max gain. Insertion Loss: 0dB ±0.05dB. Gain: 10dB to 60dB in 10dB steps ±0.1dB. Input: Differential or single-ended +(in phase), –(inverted).    CMRR: >60dB to 10kHz; approximately 50dB at 100kHz.    Sensitivity: 10mV peak with 60dB total gain for 10V peak output.    Maximum Input: ±10V peak at 0dB gain reduced in proportion to gain setting.    Impedance: 1M ohm in parallel with 100pf.    Coupling: ac or dc.    Maximum DC Component: ±100V in ac coupled mode. Output:    Maximum Voltage (o.c.): 7Vrms to 200kHz; 3Vrms  to 500kHz; 1Vrms to 1MHz.    Impedance: 50 ohms.    DC Offset: Adjustable to zero volts.    Harmonic Distortion (1V output): <–80dB (0.01%) to 10kHz <–60dB (0.1%) to 100kHz..    Wideband Noise (referred to input, 2MHz BW detector): 150 V min. gain; 25 V max. gain.    DC Stability (RTI): Typically ±10 V/ C.

GENERAL Phase Match Between Channels: 1 typical, 2 max from dc to 0.8fc; 2 typical, 4 max from 0.8fc to fc. For like models in same chassis, otherwise consult factory. Amplitude Match Between Channels: ±0.1dB max from dc to 0.8fc; ±0.2dB max from 0.8fc to fc. Crosstalk Between Channels: >85dB below full scale with input source <50 ohms. Switch: For selection of Input, +(in phase), Differential or –(inverted). Input/Output Connectors: BNC. Power: 15 watts. Weights: 1.75 lbs (.8kg). Accessories: Operating manual.

Krohn Hite 30A-3 datasheet & specifications