US 12,216,143 B2
Voltage current conversion device
Masayuki Hashisaka, Musashino (JP); Koji Muraki, Musashino (JP); and Takafumi Akiho, Musashino (JP)
Assigned to Nippon Telegraph and Telephone Corporation, Tokyo (JP)
Appl. No. 17/911,253
Filed by Nippon Telegraph and Telephone Corporation, Tokyo (JP)
PCT Filed Mar. 18, 2020, PCT No. PCT/JP2020/012152
§ 371(c)(1), (2) Date Sep. 13, 2022,
PCT Pub. No. WO2021/186653, PCT Pub. Date Sep. 23, 2021.
Prior Publication US 2023/0113379 A1, Apr. 13, 2023
Int. Cl. G01R 19/00 (2006.01); G01R 19/32 (2006.01); H01L 29/778 (2006.01); H03F 3/04 (2006.01)
CPC G01R 19/0092 (2013.01) [G01R 19/0023 (2013.01); G01R 19/32 (2013.01); H01L 29/778 (2013.01); H03F 3/04 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A current-to-voltage converter comprising:
an amplification unit having at least three stages each including a field-effect transistor (FET), a target current being fed to a first stage, a final stage constituting a source follower configured to feed back an output signal to the first stage, the amplification unit being configured to convert the target current to a voltage; and
a buffer unit that is connected to the amplification unit, constitutes a source follower including a FET, and is configured to output the converted voltage,
wherein each FET is adapted to operation at a temperature of 150 K or less.