Amplifier biasing for class-ab output stage in a transimpedance amplifier (tia)-based low-pass filter for a passive upconverter
AssigneeQUALCOMM Incorporated
InventorsSadia AFROZ, Conor DONOVAN
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Abstract
A transimpedance-based baseband filter (BBF) including a two-stage operational transconductance amplifier (OTA) having a first stage based on a folded cascode topology, the first stage electrically coupled to a second stage, the second stage having a class AB topology, the first stage having an N-type and P-type transistor pair located between a P-type transistor and an N-type transistor, the N-type and P-type transistor pair configured to provide bias signals to push-pull transistors in the second stage.
Claims26
A transimpedance-based baseband filter (BBF), comprising:
- a two-stage operational transconductance amplifier (OTA) having a first stage based on a folded cascode topology, the first stage electrically coupled to a second stage, the second stage having a class AB topology, the first stage having an N-type and P-type transistor pair located between a P-type transistor and an N-type transistor, the N-type and P-type transistor pair configured to provide bias signals to push-pull transistors in the second stage.
A method for signal conversion, comprising:
- passively upconverting a wireless local area network (WLAN) communication signal;
- passively upconverting a Bluetooth (BT) communication signal;
- selectively amplifying the passively upconverted WLAN communication signal using a common amplifier;
- and
- selectively amplifying the passively upconverted BT communication signal using the common amplifier.
A device, comprising:
- means for passively upconverting a wireless local area network (WLAN) communication signal;
- means for passively upconverting a Bluetooth (BT) communication signal;
- means for selectively amplifying the passively upconverted WLAN communication signal;
- and
- means for selectively amplifying the passively upconverted BT communication signal.
A transmit circuit, comprising:
- Bluetooth (BT) communication circuitry comprising a passive BT upconverter (BT UPC) coupled to a load;
- wireless local area network (WLAN) communication circuitry comprising a passive WLAN upconverter (WLAN UPC) coupled to the load;
- and
- a voltage-mode baseband filter (BBF) having an operational transconductance amplifier (OTA) configured to provide a voltage input signal to the BT UPC.
Dependencies are inferred from the claim text.