CN104113299A - Poly-phase filter with phase tuning - Google Patents
Poly-phase filter with phase tuning Download PDFInfo
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- CN104113299A CN104113299A CN201410151544.8A CN201410151544A CN104113299A CN 104113299 A CN104113299 A CN 104113299A CN 201410151544 A CN201410151544 A CN 201410151544A CN 104113299 A CN104113299 A CN 104113299A
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- output signal
- terminal
- positive
- phase
- homophase
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Abstract
The invention discloses a poly-phase filter with phase tuning. The poly-phase filter receives in-phase input signals I and I(plus an overline) and orthogonal input signals Q and Q(plus an overline) and provides in-phase output signals Iout and Iout(plus an overline) and orthogonal output signals Qout and Qout(plus an overline). The capacitance of each variable capacitor connected to terminals providing the in-phase output signals Iout and Iout(plus an overline) is different from the capacitance of each variable capacitor connected to the terminals providing the orthogonal output signals Qout and Qout(plus an overline) by a value two times that of a predetermined value, because the capacitance adjustment can be carried out on each group of the variable capacitors according to the predetermined value.
Description
The cross reference of related application
The sequence number that the application relates to and requires in the title of submission on April 17th, 2013 is " having the polyphase filters (Poly-Phase Filter with Phase Tuning) of planet phasing " is the priority of the U.S. Provisional Patent Application (" common unsettled provisional application ") of the 61/813rd, No. 077.Common unsettled provisional application is incorporated to its entirety herein by reference.The application be also involved in the title submitted on October 23rd, 2013 for the sequence number of " balance converter blender circuit (Balun Mixer Circuits) " be the common unsettled U.S. Patent application (" related application ") of the 14/061st, No. 479.The disclosure of related application is also incorporated to its entirety herein by reference at this.
Technical field
The present invention relates to a kind of analog filter.Particularly, the present invention relates to so a kind of analog filter, it is suitable for using in the application of mobile phone for example or wireless communications application.
Background technology
According to the sinusoidal source of fixed frequency, desirable polyphase filters output etc. amplitude homophase (also, 0 ° and 180 °) with signals orthogonal (also, 90 ° and 270 °).But, in actual embodiment, due to not the mating of source harmonic wave, circuit element, bucking voltage and spurious impedance, because these amplitude homophases and positive blending output signal are difficult to realize.
Summary of the invention
Polyphase filters receive in-phase input signals for 1 I and
and positive input signal Q and
and provide homophase output signal I
outand I
outand positive blending output signal Q
outand Q
out.According to one embodiment of the invention, be connected to homophase output signal I is provided
outwith
the electric capacity of each variable capacitor of terminal provide positive blending output signal with being connected to
and Q
outthe electric capacity of each variable capacitor of terminal different in value, and preferably differ the twice of predetermined value.This is because can carry out each group of variable capacitor by predetermined value the adjusting of capacitance.For example,, when at output signal I
out, Q
out,
with
between phase place while regulating, by will with output signal I
outwith
relevant variable capacitor increases the Δ C amount of electric capacity, simultaneously will with output signal Q
outwith
the Δ C that relevant variable capacitor reduces electric capacity measures to regulate.
Consider that in conjunction with appended accompanying drawing detailed description below will better understand the present invention.
Brief description of the drawings
Fig. 1 is the schematic diagram having shown according to the polyphase filters with planet phasing 100 of one embodiment of the invention.
Fig. 2 is the schematic diagram having shown according to the alternative embodiment of the polyphase filters with planet phasing 100 of one embodiment of the invention.
Fig. 3 has shown suppress sideband by the carrying out of the polyphase filters of the present invention function as local oscillator (LO) frequency, as for example, in balance converter blender circuit (, the circuit 600 in the Fig. 6 at related application), implement and by sinusoidal wave LO signal, square wave LO signal, there is the square wave LO signal of centre frequency and I/Q gain optimization and have that square wave LO signal drives.
Embodiment
Fig. 1 is the schematic diagram having shown according to the polyphase filters with planet phasing 100 of one embodiment of the invention.As shown in Figure 1, polyphase filters 100 receive input signal I, Q,
with
it represents the ideal mode analog signal of 0 °, 90 °, 180 ° and 270 ° phase place of same signal.Polyphase filters 100 provides corresponding output signal I
out, Q
out,
with
(representing 0 °, 90 °, 180 ° and 270 ° of phase places of output signal).Polyphase filters 100 comprises variable resistance 101a, 101b, 101c and 101d and variable capacitor 102a, 102b, 102c and 102d.In the embodiment of integrated circuit, for example, can be for example implement variable capacitor 102a, 102b, 102c and 102d with mos capacitance device array or the binary-weighted capacitors array with MOS switch.Similarly, the impedance of each variable resistance can be from for example selecting polysilicon resistance string.Can pass through for example, to locate to programme at final manufacturing step (, wafer ordered steps), or (for example, 3 wire serial bus, such as SPI or I to can be accessed by bus by outside
2c) select impedance and the capacitance for variable resistance 101a-101d and variable capacitor 102a-102d.
According to one embodiment of the invention, in order to be adjusted in signal I
out, Q
out,
with
between phase intervals time to maintain their amplitudes substantially the same, by by variable capacitor 102a and 102c(also, with homophase output signal I
outwith
those relevant variable capacitors) each recruitment Δ C, and by by variable capacitor 102b and 102d(also, with positive blending output signal Q
outwith
those relevant variable capacitors) each reduce identical amount Δ C and carry out phase adjusted.
In order to set two different capacitors array of values, the data/address bus of access array of capacitors provides the twice of the amount of bits for example, with prior art (, the polyphase filters 250 in Fig. 3 of U.S. Patent Application Publication 2008/0094133) relevant.
Similarly, adjusting can be applied to variable resistance 101a, 101b, 101c and 101d.For example, be connected to homophase output signal I is provided
outwith
the impedance of each variable resistance of terminal provide positive blending output signal with being connected to
and Q
outhe impedance of each variable resistance of terminal in value, differ two Δ R, wherein Δ R is the integral multiple of the Minimum Increment in resistance value.
Fig. 2 shows according to the schematic diagram of the alternative embodiment of the polyphase filters with planet phasing 100 of one embodiment of the invention.
For example, in the I frequency mixer and Q frequency mixer in I/Q modulator, can use polyphase filters of the present invention, described I/Q modulator forms by two balance image rejection mixers (such as the circuit 600 in Fig. 6 of related application).It is its suppress sideband (sometimes also referred to as " image carrier suppresses (image rejection) ") for a merit index of I/Q modulator.Normally, can suppress sideband be maximized by optimizing I/Q phase error and I/Q gain error (also, treating optimised variable for two).For the polyphase filters of prior art (for example, polyphase filters 250 in Fig. 3 of U.S. Patent Application Publication 2008/0094133), can, by regulating its centre frequency or regulating I/Q gain by the relative gain changing between I frequency mixer and Q frequency mixer, optimize thereby realize.For example, can complete relative gain adjusting by changing the ratio of the degeneration resistors in I frequency mixer and Q frequency mixer.
Fig. 3 has shown suppress sideband by the carrying out of the polyphase filters of the present invention function as local oscillator (LO) frequency, as for example, performed in balance converter blender circuit (, the circuit 600 in the Fig. 6 at related application) and by sinusoidal wave LO signal, square wave LO signal, there is the square wave LO signal of centre frequency and I/Q gain optimization and have that square wave LO signal drives.The centre frequency of polyphase filters is set according to fixing tables of data (centre frequency tables of data or CF tables of data).For the LO frequency of each selection, centre frequency is fixed value.As shown in Figure 3, in the time that LO input signal becomes square-wave signal from sine wave signal, at the same centre frequency value place being provided by CF tables of data, seriously reduced suppress sideband.This reduction is because for the third time and more higher harmonic content of square wave causes.Third harmonic has caused in Q channel ratio at the larger amplitude of I channel, it can cause that phase-shifted is (referring to the discussion to this phenomenon, for example, at LO Harmonic Effects on I/Q Balance and Sideband Suppression in I/Q Modulators, Texas Instrument Application Report, in May2010).
As shown in Figure 3, even after optimizing centre frequency and I/Q gain, do not use square wave LO signal (yet, waveform CF/IQgainCal) to observe the too large improvement in suppress sideband yet.But maintain identical centre frequency and square wave LO signal (also, waveform IQ-Phase/GainCal) in the time that I/Q phase place and I/Q gain is optimized time, visible suppress sideband has improvement significantly.This result has indicated I/Q phase settings optimize can be very useful in suppress sideband.Polyphase filters of the present invention is useful to realizing this optimization.
Detailed description is above provided to illustrate specific embodiment of the present invention, and is not intended to limit.Many variations within the scope of the invention and amendment are all possible.The present invention sets forth at appending claims.
Claims (5)
1. a polyphase filters, comprising:
Be used for receiving in-phase input signals for 1 I and
and positive input signal Q and
multiple terminals;
Be used for providing homophase output signal I
outwith
and positive blending output signal Q
outwith
multiple terminals;
Multiple variable resistances, described variable resistance connects respectively through for receiving in-phase input signals for 1 I, positive input signal Q, in-phase input signals for 1
and positive input signal
terminal, and connect respectively through for homophase output signal I is provided
out, positive blending output signal Q
out, homophase output signal
and positive blending output signal
terminal; And
Multiple variable capacitors, described variable capacitor connects respectively through for receiving in-phase input signals for 1 I, positive input signal Q, in-phase input signals for 1
and positive input signal
terminal, and connect respectively through for positive blending output signal Q is provided
out, homophase output signal I
out, positive blending output signal Q
outwith homophase output signal
terminal, and, be wherein connected to homophase output signal I be provided
outwith
the electric capacity of each variable capacitor of terminal provide positive blending output signal with being connected to
and Q
outthe electric capacity difference of each variable capacitor of terminal.
2. polyphase filters according to claim 1, is wherein connected to homophase output signal I is provided
outwith
the electric capacity of each variable capacitor of terminal provide positive blending output signal with being connected to
and Q
outthe electric capacity of each variable capacitor of terminal differ the twice of predetermined amount.
3. polyphase filters according to claim 1, is wherein connected to homophase output signal I is provided
outwith
the resistance of each variable resistance of terminal provide positive blending output signal with being connected to
and Q
outterminal each variable resistance resistance value on not identical.
4. a polyphase filters, comprising:
Be used for receiving in-phase input signals for 1 I and
and positive input signal Q and
multiple terminals;
Be used for providing homophase output signal I
outwith
and positive blending output signal Q
outwith
multiple terminals;
Variable resistance, described variable resistance connects respectively through for receiving in-phase input signals for 1 I, positive input signal Q, in-phase input signals for 1
and positive input signal
terminal, and for homophase output signal I is provided
out, positive blending output signal Q
out, homophase output signal
and positive blending output signal
terminal, and, be wherein connected to homophase output signal I be provided
outwith
the resistance of each variable resistance of terminal provide positive blending output signal with being connected to
and Q
outterminal each variable resistance resistance value on not identical; And
Variable capacitor, described variable capacitor connects respectively through for receiving in-phase input signals for 1 I, positive input signal Q, in-phase input signals for 1
and positive input signal
terminal, and for homophase output signal I is provided
out, positive blending output signal Q
out, homophase output signal
and positive blending output signal
terminal.
5. polyphase filters according to claim 4, is wherein connected to homophase output signal I is provided
outwith
the resistance of each variable resistance of terminal provide positive blending output signal with being connected to
and Q
outthe resistance of each variable resistance of terminal in value, differ the twice of predetermined amount.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201361813077P | 2013-04-17 | 2013-04-17 | |
| US61/813,077 | 2013-04-17 | ||
| US14/189,652 | 2014-02-25 | ||
| US14/189,652 US9106202B2 (en) | 2013-04-17 | 2014-02-25 | Poly-phase filter with phase tuning |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104113299A true CN104113299A (en) | 2014-10-22 |
| CN104113299B CN104113299B (en) | 2017-04-12 |
Family
ID=51709954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410151544.8A Active CN104113299B (en) | 2013-04-17 | 2014-04-16 | Poly-phase filter with phase tuning |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111030599A (en) * | 2018-10-09 | 2020-04-17 | 美光科技公司 | Quadrature signal generation |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010051028A (en) * | 2009-12-01 | 2010-03-04 | Mitsubishi Electric Corp | Polyphase filter |
| US20110109404A1 (en) * | 2007-07-19 | 2011-05-12 | Simon Joseph S | Balancing circuit for a metal detector |
| CN102474236A (en) * | 2009-07-06 | 2012-05-23 | 富士通株式会社 | Polyphase filter and single side band mixer comprising the polyphase filter |
| CN102577117A (en) * | 2009-10-19 | 2012-07-11 | 高通股份有限公司 | Lr polyphase filter |
| WO2012125416A1 (en) * | 2011-03-16 | 2012-09-20 | Sand 9, Inc. | Variable phase amplifier circuit and method of use |
-
2014
- 2014-04-16 CN CN201410151544.8A patent/CN104113299B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110109404A1 (en) * | 2007-07-19 | 2011-05-12 | Simon Joseph S | Balancing circuit for a metal detector |
| CN102474236A (en) * | 2009-07-06 | 2012-05-23 | 富士通株式会社 | Polyphase filter and single side band mixer comprising the polyphase filter |
| CN102577117A (en) * | 2009-10-19 | 2012-07-11 | 高通股份有限公司 | Lr polyphase filter |
| JP2010051028A (en) * | 2009-12-01 | 2010-03-04 | Mitsubishi Electric Corp | Polyphase filter |
| WO2012125416A1 (en) * | 2011-03-16 | 2012-09-20 | Sand 9, Inc. | Variable phase amplifier circuit and method of use |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111030599A (en) * | 2018-10-09 | 2020-04-17 | 美光科技公司 | Quadrature signal generation |
| CN111030599B (en) * | 2018-10-09 | 2021-09-07 | 美光科技公司 | Quadrature signal generation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104113299B (en) | 2017-04-12 |
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