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This paper describes a 380uW Rx, 56uW Tx, 2.4 GHz, GaAs based, super- regenerative transceiver. Despite the ultra low power consumption exhibited by the Tx, an output power of -11 dBm is achieved. This is due to the fact that the oscillator is only on for a very short period of time compared to the bit period. The received signal at the RF output is amplified, bit sliced and then lengthened digitally...
In this paper, a novel single-diode frequency doubler design method is proposed. The output fundamental frequency is suppressed by employing a lambda/2 feed-forward transmission line parallel with a diode instead of using balanced structure with two or more diodes. The deployment of feed-forward line reduces the complexity of matching circuit and the circuit is more compact than doubler circuit without...
This paper introduces a simple dual- band T-shaped slot antenna for the wireless local area network (WLAN) application, where a T-shaped slot with a rectangular patch feed is employed to produce two resonant frequencies of 2.4 GHz-band and 5.2 GHz-band. The measured impedance bandwidth of the proposed antenna are 650 MHz centered at 2.51 GHz and 640 MHz centered at 5.29 GHz for VSWRles2, and the measured...
This paper describes a SiGe HBT power amplifier with distortion-controllable bias circuits. MOSFETs employed in the bias circuits enable us to control the distortion of power amplifiers by adjusting the gate voltages. The power amplifier MMIC for 802.11lg wireless LANs fabricated using the technique exhibited excellent linearity and efficiency: a linear output power of 18.3 dBm and a power-added efficiency...
A small and wideband antenna for dual band (2.4/5.2 GHz bands) operation is presented. The proposed antenna has a shorting post and slits to miniaturize the size of patch. The bandwidth in the low frequency band (the 2.4 GHz band) increases as the length of the shorting post between the upper and lower patches increases. The lengths of the square patch of the proposed antenna are around 0.10lambda...
A surface transverse wave (STW) resonator based oscillator was developed in response to SONET OC-48 application. The residual noise measurement techniques are used to evaluate the noise contributions in feedback loop components, such as loop amplifier, STW resonator and electronic phase shifter, which can play important roles in determining the oscillator's output phase noise spectrum. The oscillator's...
A novel AiP(antenna in package) technology has been proposed. The antenna apparatus, which has a heat dissipation function and characteristic of radiation at the same time, can be realized by simply cutting and bending a metal plate and implemented it with standard package process that is very useful for mass production. As the demands of the integration increase, it is inevitable to integrate the...
This paper describes a 1.5-V 2.4 GHz variable gain front-end in a 0.18-mum CMOS process. The front-end achieves conversion gains of 27.0 dB and 15.0 dB in the high gain mode (HGM) and low gain mode (LGM), respectively. It also achieves input return loss, Sn, of -10.18 and -15.31 dB in the HGM and LGM, respectively. In the HGM and LGM, the front-end acquires double side band (DSB) NFs of 4.0 dB and...
This single-chip RF and modem transceiver provides a complete radio interface between the radio block, digital demodulation including time and frequency synchronization and data buffering. The number of external components is minimized so that only one crystal and one resistor and several decoupling capacitors are required. The bidirectional differential antenna pins are commonly used for RX and TX,...
This paper proposes compact novel multi-band solid inverted-F antenna (SIFA) for mobile telephone applications. Generally the planar inverted-F antenna (PIFA) is often made an internal element by using metal conductor sheet. The studied antenna configuration is different to general PIFA. Usually single-core wire is used to construct internal radiator of which the impedance bandwidth is often constricted...
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