Television receiver including an integrated band selection filter
DC CAFCFirst Claim
1. A tuner circuit receiving an input RF signal having a first transmission spectrum, the tuner circuit comprising:
- a band selection filter coupled to receive the input RF signal and provide a band selected output signal, wherein the band selection filter comprises a plurality of band pass filters, each band pass filter comprising an inductor and a variable capacitor forming an LC resonator, the inductor of the LC resonator being formed as an integrated planar spiral inductor; and
a frequency conversion circuit coupled to receive an input signal corresponding to the band selected output signal of the band selection filter and provide a frequency converted output signal having a predetermined frequency,wherein the band selection filter comprises;
a first variable amplifier having an input node coupled to receive the input RF signal and an output node providing a first output signal;
a plurality of band pass filters connected in parallel between the output node of the first variable amplifier and a first node, the first node providing the band selected output signal of the band selection filter, each band pass filter being disposed to select a different portion of the first transmission spectrum so that the plurality of band pass filters is disposed to select the entire frequency range of the first transmission spectrum; and
each band pass filter comprising;
a first switch coupled between the output node of the first variable amplifier and a second node;
a plurality of switchably connected capacitors connected in parallel between the second node and a first voltage, each switchably connected capacitor comprising a capacitor and a switch connected in series between the second node and the first voltage;
an inductor coupled between the second node and a second voltage, the inductor being an integrated planar spiral inductor, wherein the inductance of the inductor and the capacitance provided by the plurality of switchably connected capacitors form an LC resonator; and
a unity gain buffer having an input node coupled to the second node and an output node coupled to the first node providing the band selected output signal.
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Litigations
1 Petition
Accused Products
Abstract
A tuner circuit includes a band selection filter coupled to receive an input RF signal and provide a band selected output signal where the band selection filter includes a bank of band pass filters. Each band pass filter includes an inductor and a variable capacitor forming an LC resonator where the inductor is an integrated planar spiral inductor. The tuner circuit further includes a frequency conversion circuit coupled to receive an input signal corresponding to the band selected output signal and provide a frequency converted output signal having a predetermined frequency. The integrated planar spiral inductor can be formed using a single metal spiral or multiple metal spirals. In a multi-spiral structure, a first metal spiral having an inward spiral pattern and a second metal spiral having an outward spiral pattern to form an inductor with large inductance, low series resistance and high Q values, even at low frequency.
49 Citations
41 Claims
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1. A tuner circuit receiving an input RF signal having a first transmission spectrum, the tuner circuit comprising:
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a band selection filter coupled to receive the input RF signal and provide a band selected output signal, wherein the band selection filter comprises a plurality of band pass filters, each band pass filter comprising an inductor and a variable capacitor forming an LC resonator, the inductor of the LC resonator being formed as an integrated planar spiral inductor; and a frequency conversion circuit coupled to receive an input signal corresponding to the band selected output signal of the band selection filter and provide a frequency converted output signal having a predetermined frequency, wherein the band selection filter comprises; a first variable amplifier having an input node coupled to receive the input RF signal and an output node providing a first output signal; a plurality of band pass filters connected in parallel between the output node of the first variable amplifier and a first node, the first node providing the band selected output signal of the band selection filter, each band pass filter being disposed to select a different portion of the first transmission spectrum so that the plurality of band pass filters is disposed to select the entire frequency range of the first transmission spectrum; and each band pass filter comprising; a first switch coupled between the output node of the first variable amplifier and a second node; a plurality of switchably connected capacitors connected in parallel between the second node and a first voltage, each switchably connected capacitor comprising a capacitor and a switch connected in series between the second node and the first voltage; an inductor coupled between the second node and a second voltage, the inductor being an integrated planar spiral inductor, wherein the inductance of the inductor and the capacitance provided by the plurality of switchably connected capacitors form an LC resonator; and a unity gain buffer having an input node coupled to the second node and an output node coupled to the first node providing the band selected output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A band pass filter bank for a television tuner for tuning an input RF signal having a first transmission spectrum, the band pass filter bank comprising:
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a first variable amplifier having an input node coupled to receive the input RF signal and an output node providing a first output signal; a plurality of band pass filters connected in parallel between the output node of the first variable amplifier and a first node, the first node providing the band selected output signal of the band pass filter bank, each band pass filter being disposed to select a different portion of the first transmission spectrum so that the plurality of band pass filters is disposed to select the entire frequency range of the first transmission spectrum; and each band pass filter comprising; a first switch coupled between the output node of the first variable amplifier and a second node; a plurality of switchably connected capacitors connected in parallel between the second node and a first voltage, each switchably connected capacitor comprising a capacitor and a switch connected in series between the second node and the first voltage; an inductor coupled between the second node and a second voltage, the inductor being an integrated planar spiral inductor, wherein the inductance of the inductor and the capacitance provided by the plurality of switchably connected capacitors form an LC resonator; and a unity gain buffer having an input node coupled to the second node and an output node coupled to the first node providing the band selected output signal. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A band pass filter for filtering an input RF signal, comprising:
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a first variable amplifier having an input node coupled to receive the input RF signal and an output node providing a first output signal; a band pass filter connected between the output node of the first variable amplifier and a first node providing the filtered output signal, the band pass filter comprising; a first switch coupled between the output node of the first variable amplifier and a second node; a plurality of switchably connected capacitors connected in parallel between the second node and a first voltage, each switchably connected capacitor comprising a capacitor and a switch connected in series between the second node and the first voltage; an inductor coupled between the second node and a second voltage, the inductor being an integrated planar spiral inductor, wherein the inductance of the inductor and the capacitance provided by the plurality of switchably connected capacitors form an LC resonator; and a unity gain buffer having an input node coupled to the second node and an output node coupled to the first node providing the filtered output signal. - View Dependent Claims (36, 37, 38, 39, 40, 41)
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Specification