OUTPUT BUFFER WITH INDEPENDENTLY CONTROLLABLE CURRENT MIRROR LEGS

OUTPUT BUFFER WITH INDEPENDENTLY CONTROLLABLE CURRENT MIRROR LEGS

A programmable output buffer with independently controllable current mirror legs is disclosed. The output buffer includes a current mirror that has a reference leg (104) and a number of current mirror legs (106). The reference leg (104) is biased using a reference current (120) that is relatively in...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: WELCH, JIM, R, TANJI, TODD, M, WENTINK, ROBERT, S
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
AMPLIFIERS
BASIC ELECTRONIC CIRCUITRY
CONTROL OF AMPLIFICATION
ELECTRICITY
PULSE TECHNIQUE
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Beschreibung
Zusammenfassung:A programmable output buffer with independently controllable current mirror legs is disclosed. The output buffer includes a current mirror that has a reference leg (104) and a number of current mirror legs (106). The reference leg (104) is biased using a reference current (120) that is relatively independent of the supply voltage. Each of the current mirror legs (106) is coupled to the output terminal of the output buffer, and conducts a current that is proportional to the reference current. This produces an output current that is relatively independent of variations in the supply voltage. To provide a programmable output power level, each of the current mirror legs (106) are separately enabled. By controlling which of the current mirror legs are enabled, the output power of the output buffer can be controlled.