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A 2.5 V second order RF bandpass filter is presented. A new Q-enhancement structure stacked on a LNA is fabricated in a 65-nm CMOS process with a die area of 1.1 mm ?? 1.1 mm. The frequency range is adjustable in a 25% range from 1.7 GHz to 2.2 GHz while the Q is adjustable up to 50. Q and the center frequency are adjusted by binary weighted switchable capacitors. The filter draws 42 mA including...
An LNA with integrated Q-enhanced notch filter for use in FDD transceiver systems has been demonstrated. The amplifier core is coil less, made possible by the use of capacitive shunt-series feedback to simplify matching. Additionally, a Q-enhanced notch filter is integrated which attenuates TX blockers thus making an external interstage SAW filter redundant. A prototype was produced on a 65 nm CMOS...
The performance of active interference cancellation schemes in RF receiver front-ends can be seriously affected by I/Q-mismatch of the active cancellation filter core. Therefore, the influences of I/Q gain and phase mismatch on active feedforward and feedback cancellation schemes are investigated. It is found that I/Q mismatch leads to an image spectrum at the band of interest. The image can be particularly...
In the design process of integrated DC/DC converters it is desirable to assess as many critical design parameters and parasitic effects by simulation as possible as the control loop is hard to tune after fabrication. In this work, switch conduction loss of an integrated, synchronous buck converter is identified to have significant influence on control loop dynamics. Thus, an equivalent small-signal...
A feedback interference cancellation circuit is presented that uses a control loop to reject blockers in wireless receivers. The concept is based on a translational loop which subtracts a blocker replica in a feedback loop fashion. In contrast to feedforward methods loop selectivity does not depend on exact gain matching of two paths but on the open loop gain which is easier to adjust. The concept...
An LNA with integrated notch filter is demonstrated. It consists of a coilless two-stage LNA with capacitive feedback and an integrated Q-enhanced notch filter. Thus, this circuit is capable for use in FDD systems like UMTS or WCDMA without additional off-chip interstage filter, especially for highly integrated multi-band multi-standard transceivers as only one area consuming coil is used. At 100...
In this paper LC-resonator bandwidth setting techniques in deep-sub micron CMOS processes are examined and compared with the main focus on Q-enhancement, linearity, noise, power consumption and controllability at low supply voltages. Simulations have been performed using an ideal amplifier model to achieve results independent of the purpose of the circuit. The Q-enhancement is achieved by positive...
The design of an active antenna operating at a frequency of 10.5 GHz for microwave-based motion sensing applications is described. The active antenna consists of a feedback-type oscillator circuit where the resonator has been replaced by a microstrip patch antenna. The influence of a uni planar compact photonic bandgap (UC-PBG) structure that is placed around the antenna in order to suppress surface...
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