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Do you really want zero volts? A 5k resistor across 150 volts results in 30 ma - 4 ma at 20 volts - so with a simple resistor you can get 20 volts to 150 volts to result in current flow of 4 ma to 30 ma.
You need an op amp configured as a voltage input to current output converter. A Google search should give you some ideas on that. (Hint: Using a transistor at the output simplifies the circuit). You bias it to give 4mA output with 0V input. Then you adjust the gain to give you an additional 16mA with 150V input.
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