How to Make 1.2 V LVCMOS from 1.8 V LVCMOS Output
Most LVCMOS driver circuits have a certain VDD rail voltage range where requirements are met like output impedance and rise / fall times. When an amplitude is required that is below the low limit of the LVCMOS driver, there will be issues when simply lowering the VDD rail to this low voltage. Fortunately there are alternative methods to control the LVCMOS amplitude that allow amplitudes below the VDD rail low limit for the LVCMOS driver.
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