A transimpedance amplifier for capacitive micromachined ultrasonic transducers
Please cite this item using this persistent URLhttp://hdl.handle.net/11693/28942
In this thesis a design of a CMOS transimpedance ampli_er (TIA) for a capacitive micro-machined ultrasonic transducer (CMUT) is presented. CMUT's have a high electrical impedance when used as receivers. Any capacitance between the CMUT and a high impedance ampli_er will degrade the frequency response. So, we need to amplify the current rather than the voltage. This approach requires a transimpedance ampli_er. The designed TIA has a 30 MHz bandwidth and 400 kΩ transimpedance gain. The total input referred current noise of the TIA is 270 fA/√Hz at 10 MHz. The noise _gure of the TIA is 2:7 dB at 10 MHz when connected to the CMUT with 200 kΩ source resistance. The power consumption of the TIA is 10:5 mW and the size of the TIA layout is 133µm x 45µm. The TIA chip will be fabricated in AMS C35B4C3 (0:35µm) process.