Transmit Automatic Output Control insensitive to process variation
Original Publication Date: 2003-Jun-25
Included in the Prior Art Database: 2003-Jun-25
A novel approach for a transmit attenuator at 2.4GHz implemented in CMOS technology is detailed. The output voltage is proportional to device area. The output current is steered from the load so IP3 does not degrade with attenuator level. Device area is tailored so that the desired attenuator setting is maintained within .5db over device variation for an attenuator level of 0 to -24dB in 3dB steps. No on chip matching is required. No need for a separate resistive attenuator stage is required.