Figure 3From: High density trans-admittance mammography development and preliminary phantom tests Ammeter module. Ammeter module with one ammeter channel highlighted. Each side of the PCB contains 3 ammeter channels. These consist of a trans-resistance amplifier (I-V converter), filter, programmable gain amplifier and ADC. Each ammeter channel sends the digitized current to the single FPGA for independent demodulation.Back to article page