Integrate circuit

Abstract

An integrated circuit is provided. The integrated circuit comprises a voltage controlled oscillator and a first compensation capacitor. The voltage controlled oscillator generates an oscillation signal. The first compensation capacitor, coupled in parallel to the voltage controlled oscillator, receives a control voltage to generate a negative temperature coefficient capacitance to compensate for frequency drift of the oscillation signal. The control voltage is temperature dependent.

Description

technical field

[0001] The present invention relates to a digital signal processing, in particular to a digital image signal processing. Background technique

[0002] Electronic circuits widely use a Voltage Control Oscillator (Voltage Control Oscillator, VCO). In general, voltage controlled oscillators are used in local oscillators (Local Oscillator, LO) to generate signals for upconversion or downconversion in transmitters or receivers, or for phase-locked loops (Phase Lock Loop, PLL) is used to provide the clock signal in the synchronous circuit. Wireless devices, such as mobile phones in wireless communication systems, can use multiple voltage controlled oscillators to generate multiple local oscillator signals for transmitters and receivers, and clock signals for digital circuits.

[0003] Generally, a voltage controlled oscillator includes active components as well as passive components. The problem of frequency variation is caused by passive components, while the p...

Examples

Embodiment Construction

[0042] In order to make the above and other objects, features, and advantages of the present invention more comprehensible, the preferred embodiments are specifically listed below, together with the accompanying drawings, and are described in detail as follows:

[0043] The temperature coefficient of the oscillation frequency f can be obtained via the differential formula (2):

[0044] 1 / f ∂ f ∂ T = 1 / ( C p + C v ) ∂ ( C p + C v ) ∂ T ...

technical field

[0001] The present invention relates to a digital signal processing, in particular to a digital image signal processing. Background technique

[0002] Electronic circuits widely use a Voltage Control Oscillator (Voltage Control Oscillator, VCO). In general, voltage controlled oscillators are used in local oscillators (Local Oscillator, LO) to generate signals for upconversion or downconversion in transmitters or receivers, or for phase-locked loops (Phase Lock Loop, PLL) is used to provide the clock signal in the synchronous circuit. Wireless devices, such as mobile phones in wireless communication systems, can use multiple voltage controlled oscillators to generate multiple local oscillator signals for transmitters and receivers, and clock signals for digital circuits.

[0003] Generally, a voltage controlled oscillator includes active components as well as passive components. The problem of frequency variation is caused by passive components, while the p...

Examples

Embodiment Construction

[0042] In order to make the above and other objects, features, and advantages of the present invention more comprehensible, the preferred embodiments are specifically listed below, together with the accompanying drawings, and are described in detail as follows:

[0043] The temperature coefficient of the oscillation frequency f can be obtained via the differential formula (2):

[0044] 1 / f ∂ f ∂ T = 1 / ( C p + C v ) ∂ ( C p + C v ) ∂ T ...

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