Patent ID: 11943548
Assignee: CONSEJO SUPERIOR DE INVESTIGACIONES CIENTÍFICAS
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  A | IPC H

Claim 7:
8. A two dimensional sensor array for multiplexing and demultiplexing sensor element signals without using switching elements, the sensor array comprising:
transistor devices, the transistor devices being arranged in rows and columns, and each transistor's resistance being individually modulated by a signal fed at the transistor's gate;
a plurality of voltage sources for feeding the column lines with a continuous voltage waveform;
column lines, each column line connecting the source terminals of the transistor devices in the same column with a corresponding voltage source each source feeding a voltage waveform between the source terminal and the corresponding drain terminal of the transistor devices in the same column;
row lines, each row line connecting the drain terminals of the transistor devices in the same row with a lock-in amplifier; and
a plurality of lock-in amplifiers, each lock-in amplifier demultiplexing a summed continuous output current waveform in a row using differences in at least one of amplitude, frequency and phase characteristics among individual continuous current harmonic waveforms modulated by the continuous voltage waveform signals fed to the sensor elements of the same row, the summed continuous output current waveform comprising the continuous current harmonic waveforms.