| 摘要 |
A voltage to current converter circuit manufactured with a MOS process generates a linear reference current over a wide bandwidth and operates with an input signal (3) that varies to either supply rail (1,2). A voltage divider network (6,7) scales an input voltage for conversion to a linear current by a cascode current mirror (11) and a gain resistor (14). The value of the gain resistor (14) determines the transconductance of the conversion from voltage to current. A second current mirror (12) provides feedback to keep the reference current accurate. An output stage makes available high impedance source and sink current output terminals (35,34) wherein a source current and a sink current relative to the reference current are provided. Several voltage to current converter circuits (10,10 min ) may be coupled together to provide addition, subtraction, multiplication, and other circuit and system functions. |
