Artifex TZA500 High-Precision Programmable Transimpedance Amplifier

Overview

The Artifex TZA500 is a high-precision, programmable transimpedance amplifier engineered for low-noise, wide-dynamic-range current-to-voltage conversion in demanding scientific and industrial measurement applications. Based on optimized feedback topology with ultra-low input bias current op-amps and guarded layout design, the TZA500 delivers stable, linear amplification across six decades of input current — from 100 nA to 100 mA — while maintaining sub-picoampere-level noise-equivalent current (NEI) performance at its most sensitive gain settings. Its core architecture supports real-time reconfiguration of gain, bandwidth, and polarity via USB or TTL-compatible digital control lines, enabling seamless integration into automated test systems, time-resolved spectroscopy setups, and closed-loop feedback instrumentation. Unlike fixed-gain or manually switched amplifiers, the TZA500 eliminates mechanical relay wear and thermal drift-induced calibration drift, ensuring long-term measurement reproducibility under GLP/GMP-compliant laboratory conditions.

Key Features

• Programmable gain, bandwidth, and polarity via USB 2.0 or hardwired digital interface (TTL/CMOS compatible)
• Low noise-equivalent current: 30 pA RMS (at 100 nA full-scale range), scalable across all six decades
• Linear analog output: V_out = scale × I_in, with calibrated output scaling from 1 V/mA to 0.1 V/nA
• Fast transient response: 45 µs rise time (−1→+1 V), 100 µs settling time to 1% (weak signal)
• High linearity: ±0.1–0.2 dB over full dynamic range; accuracy maintained at ±1% FS
• Dual-output interface support: BR21 (for low-capacitance photodiode connections) and DB25 (for system integration)
• Input impedance effectively zero (virtual short-circuit), minimizing loading effects on high-impedance sources
• AC wall-powered operation with internal regulation; no external power supply unit required

Sample Compatibility & Compliance

The TZA500 interfaces directly with high-impedance current sources including photodiodes, photomultiplier tubes (PMTs), avalanche photodiodes (APDs), ionization chambers, piezoelectric sensors, and thermopiles. Its BR21 input connector accommodates low-capacitance, shielded cabling essential for femtoamp-level stability, while the DB25 interface enables synchronization with external trigger signals and multi-channel data acquisition systems. The amplifier complies with CE marking requirements for electromagnetic compatibility (EMC Directive 2014/30/EU) and low-voltage safety (LVD Directive 2014/35/EU). Its stable DC performance and traceable calibration protocol support adherence to ISO/IEC 17025-accredited testing environments. When integrated into regulated workflows, the USB control interface supports audit-trail logging compatible with FDA 21 CFR Part 11 requirements when paired with validated host software.

Software & Data Management

Artifex provides a Windows-based graphical user interface (GUI) with native USB HID-class driver support — requiring no additional runtime libraries or admin privileges. The GUI enables real-time parameter configuration (gain selection, bandwidth limiting, polarity inversion), live waveform preview, and export of timestamped measurement logs in CSV and HDF5 formats. An open-source Python SDK (PyTZA) is available via GitHub, supporting direct integration with LabVIEW, MATLAB, and Python-based automation frameworks (e.g., PyVISA, NIDAQmx). All configuration changes are non-volatile and retained across power cycles. Firmware updates are delivered via signed binary packages with SHA-256 checksum verification, ensuring integrity during remote maintenance in distributed lab networks.

Applications

• Time-resolved photoluminescence and fluorescence lifetime measurements using gated PMT or APD detectors
• In-line optical power monitoring in fiber-optic communication and laser manufacturing systems
• Low-current detection in scanning tunneling microscopy (STM) and atomic force microscopy (AFM) preamplification stages
• Ion beam current measurement and dosimetry in accelerator physics and radiation safety instrumentation
• Thermoelectric and pyroelectric sensor signal conditioning for precision calorimetry and environmental sensing
• OEM integration into analytical instruments requiring programmable front-end gain staging (e.g., mass spectrometers, Raman spectrometers)

FAQ

What is the minimum detectable current with the TZA500?

At the 100 nA full-scale range, the noise-equivalent current is 30 pA RMS (bandwidth-dependent); effective resolution is further enhanced by digital averaging in post-processing.

Can the TZA500 be synchronized with external triggers?

Yes — the DB25 interface includes dedicated TTL-compatible trigger-in and gate-out lines, supporting precise timing alignment with pulsed lasers, choppers, or data acquisition cards.

Is the TZA500 suitable for use in vacuum or temperature-controlled enclosures?

The unit is designed for ambient laboratory operation (15–35 °C, non-condensing). For extended environmental operation, consult Artifex Engineering for custom thermal management or hermetic packaging options.

Does the TZA500 support differential or floating inputs?

No — it operates as a single-ended, grounded-input transimpedance amplifier. For true differential current measurement, a matched pair of TZA500 units with common-mode rejection post-processing is recommended.

How is calibration traceability maintained?

Each unit ships with a factory calibration certificate traceable to PTB (Physikalisch-Technische Bundesanstalt) standards. Optional annual recalibration services include NIST-traceable documentation and uncertainty budget reporting.