CN2777856Y - Transmitting circuit for contactless card reader - Google Patents
Transmitting circuit for contactless card reader Download PDFInfo
- Publication number
- CN2777856Y CN2777856Y CN 200520039360 CN200520039360U CN2777856Y CN 2777856 Y CN2777856 Y CN 2777856Y CN 200520039360 CN200520039360 CN 200520039360 CN 200520039360 U CN200520039360 U CN 200520039360U CN 2777856 Y CN2777856 Y CN 2777856Y
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- CN
- China
- Prior art keywords
- circuit
- card reader
- power amplifier
- iso
- amplifier
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Abstract
The utility model discloses a transmitting circuit for card readers for contactless cards, which comprises a modulation circuit, a frequency spectrum shaping circuit, a preamplifier, a power amplifier and a matching circuit, wherein the modulation circuit modulates signals which conform to the ISO-14443 A type standard into carrier waves with the frequency of 13.56 MHz, modulated signals are shaped by the frequency spectrum shaping circuit to reach the requirement of the ISO-14443 A type standard and are magnified by the preamplifier and the power amplifier, and amplified signals are sent by the matching circuit through antennas in a wireless mode. The frequency spectrum of signals sent by the utility model satisfies the requirement of the ISO-14443 A type standard. The utility model has simple structure.
Description
Technical field
The utility model relates to field of wireless communication, particularly relates to the radiating circuit in a kind of non-contact card card reader radio frequency part of the ISO-14443A of satisfying type standard.
Background technology
At present, the radiating circuit that satisfies ISO-14443A type standard has multiple structure, but these circuit common characteristic are that volume is big, cost is high, the circuit structure complexity.Some circuit is in order to satisfy the requirement of signal spectrum, very complicated with modulation circuit and power amplification circuit design, some in addition adopt D/A converter, so not only increased cost, and power consumption is bigger, the circuit error probability strengthens.
Summary of the invention
The technical problems to be solved in the utility model provides a kind of radiating circuit that is used for the non-contact card card reader, and it sends the requirement that signal spectrum satisfies ISO-14443A type standard, and is simple in structure.
For solving the problems of the technologies described above, the utility model is used for the radiating circuit of non-contact card card reader, comprise modulation circuit, it is on the 13.56MHz carrier wave that the instruction that will meet ISO-14443A type standard is modulated to frequency, frequency spectrum shaping circuit is carried out shaping to modulation signal, reach the requirement of ISO-14443A type standard, preamplifier and power amplifier amplify modulation signal, and the modulation signal after match circuit will amplify sends with wireless mode by antenna.
The utility model is simple and door modulation by one, has obtained modulation waveform.Make output waveform reach the signal spectrum requirement of ISO-14443A type standard by a high-order band-pass filters, make the signal that outputs on the antenna reach certain power by simple resonance amplification.Because the utility model circuit structure is simple, components and parts are few, so volume is little, and cost is low, and circuit debugging is simple, is well suited for mass industrialized production.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is done explanation in further detail:
Accompanying drawing is the radiating circuit schematic diagram that the utility model is used for the non-contact card card reader.
Embodiment
The utility model is used for the radiating circuit of non-contact card card reader, comprise modulation circuit, it is on the 13.56MHz carrier wave that the instruction that will meet ISO-14443A type standard is modulated to frequency, for realizing that described instruction is modulated on the carrier frequency, the utility model is realized the modulation of signal by one two input and door.Frequency spectrum shaping circuit makes its requirement that reaches ISO-14443A type standard after modulating signal shaping, frequency spectrum shaping circuit realizes by the band pass filter on 3 rank.Preamplifier and power amplifier amplify modulation signal, and preamplifier is made of single NPN pipe small-signal resonance amplifier, and this amplifier is operated in category-A; The resonance amplifier that power amplifier is made up of high-power NPN pipe constitutes, and this amplifier is operated in the C class.Modulation signal after match circuit will amplify sends with wireless mode by antenna.
Below in conjunction with a specific embodiment the utility model is elaborated.
The utility model as shown in the figure is used for the radiating circuit of non-contact card card reader, and modulation circuit is realized by the logical AND gate U1A of one two input.Frequency spectrum shaping circuit adopts the band pass filter on 3 rank, and this band pass filter is by inductance L 1, and the pi network that capacitor C 4, C5 form realizes that the centre is an inductance, an end ground connection be electric capacity.The capacitor C 3 that is connected between modulation circuit and frequency spectrum shaping circuit plays every straight effect.Preamplifier is made up of NPN transistor Q1, inductance L 2, resistance R 1, R5, resistance R 1 is connected with the contact of inductance L 2 and the base stage of transistor Q1, resistance R 5 is a load resistance, be connected the collector loop of transistor Q1, with the load resistance R5 resonant circuit in parallel that is connected in parallel, constitute by inductance L 4, capacitor C 6, play the effect of bandpass filtering.Power amplifier is operated in the C class.Its circuit is by NPN transistor Q2, and inductance L 3, resistance R 6, capacitor C 11, C13, resistance R 7 constitutes, connect with capacitor C 11 again after resistance R 7 and capacitor C 13 parallel connections, be connected across then between transistor Q2 base stage and the collector electrode, inductance L 3 is connected between the base stage and emitter of transistor Q2, resistance R 6 is a load resistance, is connected the collector loop of transistor Q2.With the load resistance R6 resonant circuit in parallel that is connected in parallel, constitute by inductance L 5, capacitor C 12, C9, play the effect of filtering and impedance conversion.Be connected 2 metering functions of resistance R between preamplifier and the power amplifier, capacitor C 7 plays every straight effect.Match circuit is realized by two L networks, plays the effect of filtering and impedance conversion, and by capacitor C 8, C10, inductance L 6, L7 realize.With power amplifier output impedance, be converted to 50ohm by certain network topology structure with antenna match.
Claims (6)
1, a kind of radiating circuit that is used for the non-contact card card reader, it is characterized in that: comprise modulation circuit, it is on the 13.56MHz carrier wave that the instruction that will meet ISO-14443A type standard is modulated to frequency, frequency spectrum shaping circuit is carried out shaping to modulation signal, reach the requirement of ISO-14443A type standard, preamplifier and power amplifier amplify modulation signal, and the modulation signal after match circuit will amplify sends with wireless mode by antenna.
2, according to claims 1 described radiating circuit that is used for the non-contact card card reader, it is characterized in that: described modulation circuit is one or two input AND circuit.
3, according to claims 1 described radiating circuit that is used for the non-contact card card reader, it is characterized in that: described frequency spectrum shaping circuit is the band pass filter of high-order.
4, according to claims 1 described radiating circuit that is used for the non-contact card card reader, it is characterized in that: the tuned amplifier that described preamplifier is made up of single NPN pipe constitutes, and this amplifier is operated in category-A.
5, according to claims 1 described radiating circuit that is used for the non-contact card card reader, it is characterized in that: the resonance amplifier that described power amplifier is made up of high-power NPN pipe constitutes, and this amplifier is operated in the C class.
6, according to claims 1 or the 5 described radiating circuits that are used for the non-contact card card reader, it is characterized in that: the match circuit of power amplifier output realized by two L networks, and power amplifier output impedance is converted to 50ohm with antenna match.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520039360 CN2777856Y (en) | 2005-01-31 | 2005-01-31 | Transmitting circuit for contactless card reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520039360 CN2777856Y (en) | 2005-01-31 | 2005-01-31 | Transmitting circuit for contactless card reader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2777856Y true CN2777856Y (en) | 2006-05-03 |
Family
ID=36745230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520039360 Expired - Lifetime CN2777856Y (en) | 2005-01-31 | 2005-01-31 | Transmitting circuit for contactless card reader |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2777856Y (en) |
-
2005
- 2005-01-31 CN CN 200520039360 patent/CN2777856Y/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20150131 Granted publication date: 20060503 |