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Current stealing circuit to control the impedance of a TGMR head amplifier biasing circuit regardless of whether the head amplifier is turned on
Current stealing circuit to control the impedance of a TGMR head amplifier biasing circuit regardless of whether the head amplifier is turned on
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机译:电流窃取电路,用于控制TGMR前置放大器偏置电路的阻抗,而不管前置放大器是否打开
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摘要
An impedance controlling circuit (152) is connected across an MR head (42) and has two current paths, each including a control transistor (154,156), a current path resistor (160,158), and a biasing circuit (162,164) in series. Each side of the MR head 42 is connected between a respective one of the current path resistors (158,160) and the biasing circuits (162,168). A shunt resistor (170) is connected between the control transistors (154,156) and the current path resistors (158,160) in each of the current paths. When the control transistors (154,156) are not conducting, the current path resistors (158,160) and the shunt resistor (170) shunt the MR head (42).
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