BA4850 (50MHz, ±20V, ±1A, Slew Rate 6000V/μs High Speed Bipolar Amplifier)

Brand: NF
Model Series: BA Series

About Product

The NF BA Series High Speed Power Amplifiers handle DC to 50MHz (max.) signals and output broadband, high speed and high voltage (300Vp-p max) bipolar (both positive and negative polarities) outputs. While ordinary DC power supplies only supply one-way currents, the BA Series supply (source) and absorb (sink) currents, and handle positive and negative voltages as well, because they operate across all four quadrants. Nowadays the BA Series are widely used in various applications.

Product Features

  • Broadband, high-speed and high-voltage
    • BA4825 drives current from a large piezoelectric element or display device because the band is DC to 2MHz and the maximum high-voltage output is 300Vp-p. BA4850 faithfully reproduces pulse signals with quick rise and complex waveform signals as well, because the frequency band is DC to 50 MHz and the slew rate is 6,000V/µs. Because both can amplify DC, they can be input waveforms containing an offset or those that are asymmetric in the positive area and negative area
  • Available for capacitive and inductive loads
    • If a load containing a capacitor or coil is driven with alternating current, the current generally flows back from the load. In this case, an ordinary power supply or amplifier may not be able to drive the load. BA series amplifier also operates (i.e., outputs the current) with a capacitive or inductive load such as a piezoelectric element or solenoid. This is because it operates also with a sink, where the voltage and current directions are reverse
  • Low output impedance
    • The BA Series have low output impedance throughout the overall range (0.5Ω + 1.5 MHz or less typ. for BA4825). With the voltage drop (raised due to load connection) suppressed to the minimum, the power of the equipment is maximized

Product Functions

  • Range shifting function for changing output range (BA4825)
  • DC bias addition function for adding direct current (bias) to the output (BA4825)
  • DC offset adjustment function for setting DC offset in output to 0 (zero)
  • Equipped with output voltage monitor terminal (BNC, monitor ratio 1/100) and monitor meter (output voltage/current switching display) (BA4825)
  • Output on/off can be switched from the panel or externally controlled
  • Output polarity switching (INVT) for setting the device to either an in-phase or reversed-phase amplifier. Use of reversed-phase output enables BTL (Balanced Transformerless) connection, which doubles the output voltage and power, using two BA Series amplifiers
  • Two systems, A and B, for input. Switching and addition of the input by pressing a single key (BA4825)
  • Input impedance switchable between 50Ω and 10kΩ (BA4825)
  • The settings at power-on can be set using the dip switches on the rear panel
  • The power input is available for worldwide applications (AC100 to 230V)

Product Application

  • Driving and evaluation of piezoelectric elements
    • High voltage and high speed are required when a piezoelectric element used for a piezoelectric inverter or piezoelectric actuator is to be driven and evaluated. In addition to high-voltage output, BA Series amplifiers keep extremely small output impedance. Therefore, they can offer superior step response against piezoelectric with large capacitance piezoelectric element (See photo section)
  • Test and evaluation of display devices
    • Flat display panels such as FEDs and LCDs require high voltage for driving, and quick rise for evaluation of their response characteristics. With their high-voltage output and high slew rate, BA Series amplifiers enable accurate drive tests and evaluations (See photo section)
  • Power amplifier for signal or pulse generators
    • During evaluation process of power devices, the performance is evaluated with a broadband, high voltage, and large current. With their broadband, high speed, and high voltage output, BA Series amplifiers evaluate and test devices, using various waveforms, pulse patterns and arbitrary waveforms (See photo section)
  • Measurement of magnetizing characteristics (B-H curves)
  • The BA Series can be used for magnetization measurement such as ferrite and or amorphous materials. Since the BA Series features the high frequency of 50 MHz required for measuring B-H curves, as well as high voltage output and high stability against inductive loads, you can reproduce stable measurement (See photo section)
  • Driving of elastic surface wave ultrasonic motors and comb tooth-shaped electrodes in the field of nanotechnology and MEMS
  • High-frequency ripple tests of capacitors
  • Development of ink jet application technology
  • Characteristics tests for semiconductors such as diodes and SCRs
  • Characteristics test for the devices such as relays and switches
  • Research and development of IC cards
  • Driving use of devices and materials and other R&D use in the leading edge technology field

Standard Accessories

  1. Operation Manual
  2. Power Cable

Product Options

  • None

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Our Company

Miko, established in 1980, is a leading instrumentation distributor in Hong Kong and China.

Over the years, we have been fully engaged in the sales and marketing of electronic T&M instruments in the territory. Our market sector coverage includes telecommunication, power, data communication, audio, broadcasting and education.