scholarly journals A Wide Tuning-Range CMOS VCO with a Tunable Active Inductor

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Hsuan-Ling Kao ◽  
Ping-Che Lee ◽  
Hsien-Chin Chiu
Keyword(s):  
Degrees Of Freedom ◽  
Tuning Range ◽  
Frequency Tuning ◽  
Cmos Technology ◽  
Feedback Loops ◽  
Fine Tuning ◽  
Active Inductor ◽  
Frequency Range ◽  
Wide Tuning Range ◽  
Output Frequency

This study describes a wide tuning-range VCO using tunable active inductor (TAI) topology and cross-coupled pair configuration for radio frequency operation. The TAI used two feedback loops to form a cascode circuit to obtain more degrees of freedom for inductance value. The TAI-VCO was fabricated using a 0.18 μm CMOS technology. The coarse frequency tuning is achieved by TAIs while the fine tuning is controlled by varactors. The fabricated circuit provides an output frequency range from 0.6 to 7.2 GHz (169%). The measured phase noise is from −110.38 to −86.01 dBc/Hz at a 1 MHz offset and output power is from −11.11 to −3.89 dBm within the entire frequency range under a 1.8 V power supply.

A Low-Power Clock Generator with a Wide Frequency Tuning Range and Low Temperature Variation: Analysis and Design

2019 ◽  
Vol 29 (01) ◽  
pp. 2050012
Author(s):  
Ziba Fazel ◽  
MaryamSadat Shokrekhodaei ◽  
Mojtaba Atarodi
Keyword(s):  
Low Temperature ◽  
Low Power ◽  
Tuning Range ◽  
Frequency Tuning ◽  
Cmos Technology ◽  
Ring Oscillator ◽  
Clock Generator ◽  
Wide Tuning Range ◽  
Analysis And Design ◽  
Frequency Changes

This paper presents a quadrature-clock generator based on a novel low-power ring oscillator with a wide frequency tuning range and low temperature variations. The proposed ring oscillator consists of two differential delay cells with a new controllable capacitive load of an MOS transistor. The wide tuning range is achieved due to transistor utilization in different regions and considering its resistance not to narrow down the frequency range. Delay cells are biased with a minimum possible value of a proportion to absolute temperature current to decrease frequency variations to temperature while the power consumption is kept low. The validation of the proposed methods is proved by circuit analysis. Post-layout simulation results of the proposed clock generator in 180[Formula: see text]nm CMOS technology are also presented. It exhibits a wide tuning range of 807 MHz to 2.66 GHz. The phase noise of the output signal is about [Formula: see text][Formula: see text]dBc/Hz at 10[Formula: see text]MHz offset frequency. Frequency changes less than [Formula: see text] in the temperature range of [Formula: see text]C–[Formula: see text]C. The clock generator consumes 0.657[Formula: see text]mW of power. Results show improvement in comparison to the previous works.

scholarly journals Feasibility of Tunable Amplifier and Bandpass Filter for Mobile Handsets Using Active Inductor Circuits

2002 ◽  
Vol 25 (4) ◽  
pp. 307-319
Author(s):  
J. Rodriguez Tellez ◽  
N. T. Ali ◽  
B. Majeed
Keyword(s):  
Tuning Range ◽  
Bandpass Filter ◽  
Frequency Tuning ◽  
Low Cost ◽  
Active Inductor ◽  
Noise Power ◽  
Gaas Mesfet ◽  
Active Inductors ◽  
Mobile Handset ◽  
Tuning Function

In this paper active inductor circuits are employed to assess their suitability for providing a tuning function in GaAs MMIC circuits. The specifications for a mobile handset amplifier and a bandpass filter operating from a 3 V supply rail are used as test vehicles. The design and simulation of the circuits employs a low-cost commercially available low pinch-off GaAs MESFET process. The suitability of active inductors for tuning in such applications considers issues such as frequency tuning range, noise, power consumption and stability.

A Low Phase Noise, Wide Tuning Range 20GHz Magnetic-Coupled Hartley-VCO in a 28nm CMOS Technology

2019 ◽  
Author(s):  
Daniel Reiter ◽  
Hao Li ◽  
Herbert Knapp ◽  
Jonas Kammere ◽  
Soran Majied ◽  
...  
Keyword(s):  
Phase Noise ◽  
Tuning Range ◽  
Cmos Technology ◽  
Wide Tuning Range ◽  
Low Phase Noise
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